APA (7th ed.) Citation

HILL, W. F. (1970). Psychology: Principles and problems.

Chicago Style (17th ed.) Citation

HILL, Winfred F. Psychology: Principles and Problems. 1970.

MLA (8th ed.) Citation

HILL, Winfred F. Psychology: Principles and Problems. 1970.

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