APA (7th ed.) Citation

Allport, G. W., Powers, E., & Vernon, P. E. (1967). Studies in expressive movement. Hafner.

Chicago Style (17th ed.) Citation

Allport, Gordon Willard, Edwin Powers, and Philip Ewart Vernon. Studies in Expressive Movement. New York: Hafner, 1967.

MLA (9th ed.) Citation

Allport, Gordon Willard, et al. Studies in Expressive Movement. Hafner, 1967.