APA (7th ed.) Citation

Feil, O., Spindelberger, G., & Spindelberger, L. (1957). Ludwig U. Grete Spindelberger.

Chicago Style (17th ed.) Citation

Feil, Otto, Grete Spindelberger, and Ludwig Spindelberger. Ludwig U. Grete Spindelberger. [S.l, 1957.

MLA (9th ed.) Citation

Feil, Otto, et al. Ludwig U. Grete Spindelberger. 1957.

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