APA (7th ed.) Citation

Linguaphone Institute. (1940). Linguaphone: [English pronunciation]. Linguaphone Institute.

Chicago Style (17th ed.) Citation

Linguaphone Institute. Linguaphone: [English Pronunciation]. New York: Linguaphone Institute, 1940.

MLA (9th ed.) Citation

Linguaphone Institute. Linguaphone: [English Pronunciation]. Linguaphone Institute, 1940.

Warning: These citations may not always be 100% accurate.