APA (7th ed.) Citation

Helmstadter, G. C. (1964). Principles of psychological measurement. Appleton-Century-Crofts.

Chicago Style (17th ed.) Citation

Helmstadter, G. C. Principles of Psychological Measurement. New York: Appleton-Century-Crofts, 1964.

MLA (9th ed.) Citation

Helmstadter, G. C. Principles of Psychological Measurement. Appleton-Century-Crofts, 1964.

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