APA (7th ed.) Citation

Denning, D. E., & Schneider, F. B. (1980). Personal keys, group keys and master keys.

Chicago Style (17th ed.) Citation

Denning, Dorothy E., and Fred B. Schneider. Personal Keys, Group Keys and Master Keys. Ithaca, New York, 1980.

MLA (9th ed.) Citation

Denning, Dorothy E., and Fred B. Schneider. Personal Keys, Group Keys and Master Keys. 1980.