APA (7th ed.) Citation

Koestler, A., & Atholl, K. (1937). Spanish testament. London: Gollancz.

Chicago Style (17th ed.) Citation

Koestler, Arthur, and Katharine Atholl. Spanish Testament. London: Gollancz, 1937.

MLA (8th ed.) Citation

Koestler, Arthur, and Katharine Atholl. Spanish Testament. London: Gollancz, 1937.

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