APA (7th ed.) Citation

Gmelin, O. (1933). Frühling in Deutschland. Gerhard Stalling.

Chicago Style (17th ed.) Citation

Gmelin, Otto. Frühling in Deutschland. Oldenburg: Gerhard Stalling, 1933.

MLA (9th ed.) Citation

Gmelin, Otto. Frühling in Deutschland. Gerhard Stalling, 1933.