APA (7th ed.) Citation

Nagel. (1991). The 6 keys to company success. Director Books.

Chicago Style (17th ed.) Citation

Nagel. The 6 Keys to Company Success. Cambridge: Director Books, 1991.

MLA (9th ed.) Citation

Nagel. The 6 Keys to Company Success. Director Books, 1991.

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