APA (7th ed.) Citation

Kaplan, H. I. (1972). Groups and drugs. Modern group book.

Chicago Style (17th ed.) Citation

Kaplan, Harold I. "Groups and Drugs." Modern Group Book 1972.

MLA (9th ed.) Citation

Kaplan, Harold I. "Groups and Drugs." Modern Group Book, 1972.

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