Cita APA (7a ed.)

Wöhrle, G., & Althoff, J. (1999). Biologie. Franz Steiner.

Cita Chicago Style (17a ed.)

Wöhrle, Georg, y Jochen Althoff. Biologie. Stuttgart: Franz Steiner, 1999.

Cita MLA (9a ed.)

Wöhrle, Georg, y Jochen Althoff. Biologie. Franz Steiner, 1999.