MLA

Müller, Walter E, and Walter E Muller. St. John's Wort and Its Active Principles In Depression and Anxiety. Birkhäuser Basel, 2005.

APA

Müller, W. E, & Muller, W. E. (2005). St. John's Wort and its Active Principles in Depression and Anxiety. Birkhäuser Basel.

Chicago

Müller, Walter E., and Walter E Muller. St. John's Wort and Its Active Principles In Depression and Anxiety. : Birkhäuser Basel, 2005.