Mitcheson, L; McCambridge, J; Byrne, S; (2007) Pilot cluster-randomised trial of adjunctive motivational interviewing to reduce crack cocaine use in clients on methadone maintenance. European addiction research, 13 (1). pp. 6-10. ISSN 1022-6877 DOI: https://doi.org/10.1159/000095809 Full text not available from this repository.

Taylor, M; Jinabhai, CC; Naidoo, K; Kleinschmidt, I; Dlamini, SB; (2003) An epidemiological perspective of substance use among high school pupils in rural KwaZulu-Natal. South African Medical Journal, 93 (2). pp. 136-40. ISSN 0256-9574 https://researchonline.lshtm.ac.uk/id/eprint/9971