APA (7th ed.) Citation

Froeschels, E., Dittrich, O., Wilheim, I., & Ferre, N. (1932). Psychological elements in speech. Expression company.

Chicago Style (17th ed.) Citation

Froeschels, Emil, Ottmar Dittrich, Ilka Wilheim, and Nels Ferre. Psychological Elements in Speech. Boston, Mass.: Expression company, 1932.

MLA (9th ed.) Citation

Froeschels, Emil, et al. Psychological Elements in Speech. Expression company, 1932.