APA

Samuelsson G., . (2004). Drugs of natural origin. Stockholm: Apotekarsocieteten.

Chicago

Samuelsson Gunnar, . 2004. Drugs of natural origin. Stockholm: Apotekarsocieteten.

Harvard

Samuelsson G., . (2004). Drugs of natural origin. Stockholm: Apotekarsocieteten.

MLA

Samuelsson Gunnar, . Drugs of natural origin. Stockholm: Apotekarsocieteten. 2004.