APA (7th ed.) Citation

Ludwig, H. (1977). Gerhard Geyer 70 Jahre.

Chicago Style (17th ed.) Citation

Ludwig, Hans-Jörg. Gerhard Geyer 70 Jahre. 1977.

MLA (9th ed.) Citation

Ludwig, Hans-Jörg. Gerhard Geyer 70 Jahre. 1977.

Warning: These citations may not always be 100% accurate.