Cita APA

Trager, C., & Henderson, S. C. (1983). The PD's: Pronunciation drills for learners of english. New Jersey: Prentice-Hall, Inc.

Chicago Style Citation

Trager, Crowell, i Sara Cook Henderson. The PD's: Pronunciation Drills for Learners of English. New Jersey: Prentice-Hall, Inc, 1983.

Cita MLA

Trager, Crowell, i Sara Cook Henderson. The PD's: Pronunciation Drills for Learners of English. New Jersey: Prentice-Hall, Inc, 1983.