APA (7th ed.) Citation

Bonus, B., & Heinrichsen, F. (1936). Das Olaf Buch. Thienemann.

Chicago Style (17th ed.) Citation

Bonus, Beate, and Friedrich Heinrichsen. Das Olaf Buch. Stuttgart: Thienemann, 1936.

MLA (8th ed.) Citation

Bonus, Beate, and Friedrich Heinrichsen. Das Olaf Buch. Thienemann, 1936.

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