Cita APA (7a ed.)

Orion, G. F. (1988). Pronouncing American English: Sounds, stress, and intonation : answer key. Heinle & Heinle.

Cita Chicago Style (17a ed.)

Orion, Gertrude F. Pronouncing American English: Sounds, Stress, and Intonation : Answer Key. Boston: Heinle & Heinle, 1988.

Cita MLA (9a ed.)

Orion, Gertrude F. Pronouncing American English: Sounds, Stress, and Intonation : Answer Key. Heinle & Heinle, 1988.