APA (7th ed.) Citation

Udet, E., & Kirkness, K. (1937). Ace of the black cross. Newnes.

Chicago Style (17th ed.) Citation

Udet, Ernst, and Kenneth Kirkness. Ace of the Black Cross. London: Newnes, 1937.

MLA (9th ed.) Citation

Udet, Ernst, and Kenneth Kirkness. Ace of the Black Cross. Newnes, 1937.

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