Classen, G., Bergner, U., & Rennert, M. (1991). Feldstudie zur Kokainabhängigkeit. Caritas <Freiburg, Breisgau>, 92(4), 178-182.
Chicago Style (17th ed.) CitationClassen, Gerhard, Ulrike Bergner, and Monika Rennert. "Feldstudie Zur Kokainabhängigkeit." Caritas <Freiburg, Breisgau> 92, no. 4 (1991): 178-182.
MLA (9th ed.) CitationClassen, Gerhard, et al. "Feldstudie Zur Kokainabhängigkeit." Caritas <Freiburg, Breisgau>, vol. 92, no. 4, 1991, pp. 178-182.
Warning: These citations may not always be 100% accurate.