Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Grapendaal, M., Ed Leuw, i J. M. 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 (9th ed.)

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