Cita APA

Crowell Trager, E., & Cook Henderson, S. (1956). Pronunciation drills for learners of english (2a. ed.). EE.UU: Prentice-Hall.

Citación estilo Chicago

Crowell Trager, Edith, y Sara Cook Henderson. Pronunciation Drills for Learners of English. 2a. ed. EE.UU: Prentice-Hall, 1956.

Cita MLA

Crowell Trager, Edith, y Sara Cook Henderson. Pronunciation Drills for Learners of English. 2a. ed. EE.UU: Prentice-Hall, 1956.