APA
Smart R. G., Arif A., Hughes P. H., Medina Mora M. E., Navaratnam V., Varma V. K., Wadud K. A. & World Health Organization. (1981). Drug use among non-student youth. Geneva: World Health Organization.
Chicago
Smart Reginald George, Arif Awni, Hughes P H, Medina Mora Maria Elena, Navaratnam V, Varma V K, Wadud K A and World Health Organization. 1981. Drug use among non-student youth. Geneva: World Health Organization.
Harvard
Smart R. G., Arif A., Hughes P. H., Medina Mora M. E., Navaratnam V., Varma V. K., Wadud K. A. and World Health Organization. (1981). Drug use among non-student youth. Geneva: World Health Organization.
MLA
Smart Reginald George, Arif Awni, Hughes P H, Medina Mora Maria Elena, Navaratnam V, Varma V K, Wadud K A and World Health Organization. Drug use among non-student youth. Geneva: World Health Organization. 1981.