McElrath, Karen (2005) MDMA and sexual behavior: ecstasy users' perceptions about sexuality and sexual risk. Substance Use & Misuse , 40 , (9/10) , pp. 1461-1477.

McKinney, Adele and Coyle, Kieran (2004) Research note, patterns of alcohol consumption in a Northern Irish sample. Substance Use & Misuse , 40 , (4) , pp. 573-579.