APA (7th ed.) Citation

Ettelt, H. (1988). Does the 80/20 Rule Apply to Books?

Chicago Style (17th ed.) Citation

Ettelt, Harold. Does the 80/20 Rule Apply to Books? 1988.

MLA (9th ed.) Citation

Ettelt, Harold. Does the 80/20 Rule Apply to Books? 1988.

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