APA (7th ed.) Citation

Schönfelder, P. (1959). Alexander von Humboldt. Lucie Groszer.

Chicago Style (17th ed.) Citation

Schönfelder, Piana. Alexander Von Humboldt. Berlin: Lucie Groszer, 1959.

MLA (8th ed.) Citation

Schönfelder, Piana. Alexander Von Humboldt. Lucie Groszer, 1959.

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