APA (7th ed.) Citation

Wallengren, H. D. J. (1929). Unsere Erde. Gefion.

Chicago Style (17th ed.) Citation

Wallengren, Hans Daniel Johan. Unsere Erde. Berlin [u.a.]: Gefion, 1929.

MLA (9th ed.) Citation

Wallengren, Hans Daniel Johan. Unsere Erde. Gefion, 1929.

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