Gaya APA

Heymann, P, B., Brownsberger, W, N. (2001). Drug addiction and drug policy : the struggle to control dependence . London: Hardvard University Press.

Gaya MLA

Heymann, Philip, B.., Brownsberger, William, N.. "Drug addiction and drug policy : the struggle to control dependence". London: Hardvard University Press, 2001. Text.