APA (7th ed.) Citation

Helmstadter, G. C. (1966). Prinicples of psychological measurement / by G.C. Helmstadter. Methuen.

Chicago Style (17th ed.) Citation

Helmstadter, G. C. Prinicples of Psychological Measurement / by G.C. Helmstadter. Methuen, 1966.

MLA (9th ed.) Citation

Helmstadter, G. C. Prinicples of Psychological Measurement / by G.C. Helmstadter. Methuen, 1966.

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