APA (7th ed.) Citation

(1991). Die Ufos (7. german pr.). Time-Life Bücher.

Chicago Style (17th ed.) Citation

Die Ufos. 7. german pr. Amsterdam: Time-Life Bücher, 1991.

MLA (9th ed.) Citation

Die Ufos. 7. german pr. Time-Life Bücher, 1991.

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