APA (7th ed.) Citation

Ettelt, H. (1988). When Can You Weed an Unused Book?

Chicago Style (17th ed.) Citation

Ettelt, Harold. When Can You Weed an Unused Book? 1988.

MLA (9th ed.) Citation

Ettelt, Harold. When Can You Weed an Unused Book? 1988.

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