APA (7th ed.) Citation

Hitler, A., Maser, W., & Pomerans, A. J. (1974). Hitler's letters and notes. Heinemann.

Chicago Style (17th ed.) Citation

Hitler, Adolf, Werner Maser, and Arnold J. Pomerans. Hitler's Letters and Notes. London: Heinemann, 1974.

MLA (8th ed.) Citation

Hitler, Adolf, et al. Hitler's Letters and Notes. Heinemann, 1974.