APA
Watkins T. R., Lewellen A. & Barrett M. C. (2001). Dual diagnosis : an integrated approach to treatment. Thousand Oaks: Sage Publications.
Chicago
Watkins Ted R, Lewellen Ara and Barrett Marjie C. 2001. Dual diagnosis : an integrated approach to treatment. Thousand Oaks: Sage Publications.
Harvard
Watkins T. R., Lewellen A. and Barrett M. C. (2001). Dual diagnosis : an integrated approach to treatment. Thousand Oaks: Sage Publications.
MLA
Watkins Ted R, Lewellen Ara and Barrett Marjie C. Dual diagnosis : an integrated approach to treatment. Thousand Oaks: Sage Publications. 2001.
BOEKEN/BROCHURES