Cita APA

Avery, E., Dorsey, J. O., & Sickels, V. A. (1928). First principles of speech training. D. Appleton and company.

Citación estilo Chicago

Avery, Elizabeth, Jane Olive Dorsey, and Vera Abigail Sickels. First Principles of Speech Training. New York: D. Appleton and company, 1928.

Cita MLA

Avery, Elizabeth, et al. First Principles of Speech Training. D. Appleton and company, 1928.