APA (7th ed.) Citation

Hitler, A., & Trevor-Roper, H. R. (1972). Hitler's secret conversations, 1941-1944. Octagon Books.

Chicago Style (17th ed.) Citation

Hitler, Adolf, and H. R. Trevor-Roper. Hitler's Secret Conversations, 1941-1944. New York: Octagon Books, 1972.

MLA (9th ed.) Citation

Hitler, Adolf, and H. R. Trevor-Roper. Hitler's Secret Conversations, 1941-1944. Octagon Books, 1972.