APA (7th ed.) Citation

Pfeiffer, H., Rusch, H., & Heyde, W. G. (1969). Leipzig (o.A.). Brockhaus.

Chicago Style (17th ed.) Citation

Pfeiffer, Hans, Heinz Rusch, and W. Gerhard Heyde. Leipzig. o.A. Leipzig: Brockhaus, 1969.

MLA (8th ed.) Citation

Pfeiffer, Hans, et al. Leipzig. o.A. Brockhaus, 1969.