Hay, Gordon and McCarthy, Elizabeth and Swithenbank, Zoe (2022) A scoping review for evaluation of drug rehabilitation outcomes and impacts in Ireland. Dublin: Health Research Board.

Hay, Gordon and Jaddoa, Ali and Oyston, Jane and Webster, Jane and Van Hout, Marie Claire and Rael dos Santos, Anderson (2017) Estimating the prevalence of problematic opiate use in Ireland using indirect statistical methods. Dublin: National Advisory Committee on Drugs and Alcohol.

Hay, Gordon and Oyston, Jane and Porcellato, Lorna and Madden, Hannah and Ross, Kim and Timpson, Hannah (2015) Evaluation of rapid access to alcohol detoxification acute referral (RADAR). Liverpool: Centre for Public Health, Liverpool John Hopkins University.

Hay, Gordon and Rael dos Santos, Anderson and Worsley, Joanne (2014) UK: Estimates of the prevalence of opiate use and/or crack cocaine use, 2011/12: Sweep 8 report. London: National Treatment Agency for Substance Misuse.

Hay, Gordon and Gannon, Maria and Casey, Jane and Millar, Tim (2011) Estimates of the prevalence of opiate use and/or crack cocaine use, 2009/10: Sweep 6 report. London: National Treatment Agency for Substance Misuse.