Welches Credo?

MLA

Drewermann, Eugen, Eugen Biser, and Michael Albus. Welches Credo?. Freiburg: Herder, 1993.

APA

Drewermann, E., Biser, E., & Albus, M. (1993). Welches Credo?. Freiburg: Herder.

Chicago

Drewermann, Eugen, and Eugen Biser. Welches Credo?. Edited by Michael Albus. Freiburg: Herder, 1993.