Cita APA (7th ed.)

ebrary, Inc, Weber, H., & Drees, S. (2005). New York. K.G. Saur.

Cita Chicago (17th ed.)

ebrary, Inc, Horst Weber, i Stefan Drees. New York. München: K.G. Saur, 2005.

Cita MLA (9th ed.)

ebrary, Inc, et al. New York. K.G. Saur, 2005.