Cita APA (7a ed.)

Albrecht, H., & Kalmthout, A. M. v. (1989). Preface. Drug policies in Western Europe.

Cita Chicago Style (17a ed.)

Albrecht, Hans-Jörg, y Anton M. van Kalmthout. "Preface." Drug Policies in Western Europe 1989.

Cita MLA (9a ed.)

Albrecht, Hans-Jörg, y Anton M. van Kalmthout. "Preface." Drug Policies in Western Europe, 1989.