Cita APA (7a ed.)

Samuelsson, G. (1999). Drugs of natural origin: A textbook of pharmacognosy (4th rev. ed.). Apotekarsocieteten.

Cita Chicago Style (17a ed.)

Samuelsson, Gunnar. Drugs of Natural Origin: A Textbook of Pharmacognosy. 4th rev. ed. Stockholm: Apotekarsocieteten, 1999.

Cita MLA (9a ed.)

Samuelsson, Gunnar. Drugs of Natural Origin: A Textbook of Pharmacognosy. 4th rev. ed. Apotekarsocieteten, 1999.