MLA

Herrling, Paul L, et al. Natural Compounds As Drugs Volume I. Birkhäuser Basel, 2008.

APA

Herrling, P. L, Amstutz, R., Matter, A., & Petersen, F. (2008). Natural Compounds as Drugs Volume I. Birkhäuser Basel.

Chicago

Herrling, Paul L., René Amstutz, Alex Matter, and Frank Petersen. Natural Compounds As Drugs Volume I. : Birkhäuser Basel, 2008.