APA (7th ed.) Citation

Purcell, G. R. (1972). Reference Books of 1971.

Chicago Style (17th ed.) Citation

Purcell, Gary R. Reference Books of 1971. 1972.

MLA (9th ed.) Citation

Purcell, Gary R. Reference Books of 1971. 1972.

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