APA (7th ed.) Citation

Drenckhahn, F. (1951). A Geometrical Contribution.

Chicago Style (17th ed.) Citation

Drenckhahn, Friedr. A Geometrical Contribution. 1951.

MLA (8th ed.) Citation

Drenckhahn, Friedr. A Geometrical Contribution. 1951.

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