APA (7th ed.) Citation

Kretke, G. L., & Hopkins, K. D. (1973). User's Guide and Orientation to Canned Computer Programs.

Chicago Style (17th ed.) Citation

Kretke, George L., and Kenneth D. Hopkins. User's Guide and Orientation to Canned Computer Programs. 1973.

MLA (9th ed.) Citation

Kretke, George L., and Kenneth D. Hopkins. User's Guide and Orientation to Canned Computer Programs. 1973.

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