Cita APA (7a ed.)

Grapendaal, M., Leuw, E., & Nelen, H. (1995). A world of opportunities: Life-style and economic behavior of heroin addicts in Amsterdam. State University of New York Press.

Cita Chicago Style (17a ed.)

Grapendaal, Martin, Ed Leuw, y Hans Nelen. A World of Opportunities: Life-style and Economic Behavior of Heroin Addicts in Amsterdam. Albany: State University of New York Press, 1995.

Cita MLA (9a ed.)

Grapendaal, Martin, et al. A World of Opportunities: Life-style and Economic Behavior of Heroin Addicts in Amsterdam. State University of New York Press, 1995.