1. Accessing hidden and hard-to-reach populations: Snowball research strategies;Atkinson,2001
2. Consuming life;Bauman,2007
3. “Hell, I'm an addict but I ain't no junkie”. An ethnographic analysis of aging heroin users;Boeri;Human Organization,2004
4. Heroin century;Carnwath,2002
5. Classically conditioned factors in drug dependence;Childress,1992