APA (7th ed.) Citation

Lewis, B. (1980). The assassins: A radical sect in Islam. Octagon Books.

Chicago Style (17th ed.) Citation

Lewis, Bernard. The Assassins: A Radical Sect in Islam. New York: Octagon Books, 1980.

MLA (9th ed.) Citation

Lewis, Bernard. The Assassins: A Radical Sect in Islam. Octagon Books, 1980.