APA (7th ed.) Citation

Caesar, J., & Gardner, J. F. (1967). The Civil War. Penguin Books.

Chicago Style (17th ed.) Citation

Caesar, Julius, and Jane F. Gardner. The Civil War. Harmondsworth, England ; New York, N.Y.: Penguin Books, 1967.

MLA (9th ed.) Citation

Caesar, Julius, and Jane F. Gardner. The Civil War. Penguin Books, 1967.