McCrystal, Patrick and Higgins, Kathryn and Percy, Andrew and Thornton, Maeve (2005) Adolescent substance abuse among young people excluded from school in Belfast. Drugs: Education, Prevention and Policy , 12 , (2) , pp. 101-112.

McCrystal, Patrick and Winning, Kerry (2009) Cannabis reclassification: What is the message to the next generation of cannabis users? Child Care in Practice , 15 , (1) , pp. 57-73.

McCrystal, Patrick and Percy, Andrew and Higgins, Kathryn (2007) The cost of drug use in adolescence: Young people, money and substance abuse. Drugs: Education, Prevention and Policy , 14 , (1) , pp. 19-28.

McAloney, Kareena and McCrystal, Patrick and Percy, Andrew and McCartan, Claire (2009) Damaged youth: Prevalence of community violence exposure and implications for adolescent well-being in a post conflict society. Journal of Community Psychology , 37 , (5) , pp. 635-648.

McCrystal, Patrick (2008) Drug prevention for young people with social, emotional and behavioural difficulties attending special education provision. Emotional and Behavioural Difficulties , 13 , (4) , pp. 305-314.

McCrystal, Patrick and Higgins, Kathryn and Percy, Andrew (2005) Drug use amongst 12- and 13-year-olds attending emotional and behavioural difficulty units in Belfast. Emotional and Behavioural Difficulties , 10 , (3) , pp. 203-218.

McCrystal, Patrick and Percy, Andrew and Higgins, Kathryn (2007) Drug use amongst young people attending emotional and behavioural difficulty units during adolescence: a longitudinal analysis. Emotional and Behavioural Difficulties , 12 , (1) , pp. 49-68.

McCrystal, Patrick and Percy, Andrew and Higgins, Kathryn (2006) Drug use patterns and behaviours of young people at an increased risk of drug use during adolescence. International Journal of Drug Policy , 17 , (5) , pp. 393-401.

McCrystal, Patrick and Winning, Kerry (2009) Drugs education and prevention for school-aged young people. Child Care in Practice , 15 , (4) , pp. 341-352.

McCrystal, Patrick and Higgins, Kathryn and Percy, Andrew (2007) Exclusion and marginalisation in adolescence: the experience of school exclusion on drug use and antisocial behaviour. Journal of Youth Studies , 10 , (1) , pp. 35-54.

Percy, Andrew and Thornton, Maeve and McCrystal, Patrick (2008) The extent and nature of family alcohol and drug use: findings from the Belfast youth development study. Child Abuse Review , 17 , (6) , pp. 371-386.

McCrystal, Patrick and Percy, Andrew (2009) Factors associated with teenage ecstasy use. Drugs: Education Prevention and Policy , 10 , (17) , pp. 507-527.

McCrystal, Patrick and Percy, Andrew and Higgins, Kathryn (2007) Frequent cannabis use among 14/15 years old in Northern Ireland. Drug and Alcohol Dependence , 88 , (1) , pp. 19-27.

McCrystal, Patrick and Percy, Andrew (2010) Patterns of substance use among young people attending colleges of further education in Northern Ireland. Drugs: Education Prevention and Policy , 18 , (1) , pp. 69-76.

McCrystal, Patrick and Percy, Andrew (2009) A profile of adolescent cocaine use in Northern Ireland. International Journal of Drug Policy , 20 , (4) , pp. 357-364.

McCrystal, Patrick (2008) Researching children and young people living in residential state care: hurdles on the path to consent. Research Ethics , 4 , (3) , pp. 89-94.

Percy, Andrew and MdAlister, Siobhan and Higgins, Kathryn and McCrystal, Patrick and Thornton, Maeve (2005) Response consistency in young adolescents' drug use self-reports: a recanting rate analysis. Addiction , 100 , (2) , pp. 189-196.

Duncan, Laura and McCrystal, Patrick (2002) School exclusion and adolescent drug use in Northern Ireland: a problem being addressed? Child Care in Practice , 8 , (3) , pp. 176-186.

McCrystal, Patrick and Higgins, Kathryn and Percy, Andrew (2006) School exclusion drug use and delinquency in adolescence. Journal of Adolescence , 29 , (5) , pp. 829-836.

Perra, Oliver and Fletcher, Adam and Bonell, Chris and Higgins, Kathryn and McCrystal, Patrick (2012) School-related predictors of smoking, drinking and drug use: evidence from the Belfast Youth Development Study. Journal of Adolescence , 35 , (2) , pp. 315-324.

Higgins, Kathryn and Percy, Andrew and McCrystal, Patrick (2004) Secular trends in substance use: the conflict and young people in Northern Ireland. Journal of Social Issues , 60 , (3) , pp. 485-506.

McAloney, Kareena and McCrystal, Patrick and Percy, Andrew (2010) Sex, drugs and STDs: Preliminary findings from the Belfast Youth Development Study. Drugs: Education, Prevention, and Policy , 17 , (4) , pp. 443-453.

McCrystal, Patrick (2004) Social exclusion – a holistic approach to understanding adolescent drug use. Radical Statistics , (85) , pp. 1-17.

McCrystal, Patrick and Mayock, Paula and Hannaford, Sarah (2011) A study of cocaine use in Northern Ireland 2009. Belfast: Department of Health, Social Services and Public Safety.

McCrystal, Patrick and Higgins, Kathryn and Percy, Andrew (2005) Substance abuse among 12 and 13-year-old young people in Belfast at high risk of developing problem drug use. Child Care in Practice , 11 , (3) , pp. 313-321.

McCrystal, Patrick and Percy, Andrew and Higgins, Kathryn (2008) Substance use among young people living in residential state care. Child Care in Practice , 14 , (2) , pp. 181-192.

McCrystal, Patrick and Higgins, Kathryn and Percy, Andrew (2007) Substance use behaviours of young people with a moderate learning disability: a longitudinal analysis. American Journal of Drug and Alcohol Abuse , 33 , (1) , pp. 155-161.

Percy, Andrew and Wilson, Joanne and McCartan, Claire and McCrystal, Patrick (2011) Teenage drinking cultures. York: Joseph Rowntree Foundation.