APA (7th ed.) Citation

Norton, P., & Hahn, H. (1991). Peter Norton's guide to Unix. Bantam Books.

Chicago Style (17th ed.) Citation

Norton, Peter, and Harley Hahn. Peter Norton's Guide to Unix. New York: Bantam Books, 1991.

MLA (8th ed.) Citation

Norton, Peter, and Harley Hahn. Peter Norton's Guide to Unix. Bantam Books, 1991.

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