APA (7th ed.) Citation

Rogers, C. R. (1973). Encounter groups / by Carl R. Rogers. Penguin Books.

Chicago Style (17th ed.) Citation

Rogers, Carl R. Encounter Groups / by Carl R. Rogers. Penguin Books, 1973.

MLA (9th ed.) Citation

Rogers, Carl R. Encounter Groups / by Carl R. Rogers. Penguin Books, 1973.

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