APA (7th ed.) Citation

Thomas, C. K. (1947). An introduction to the phonetics of American English. Ronald Press.

Chicago Style (17th ed.) Citation

Thomas, Charles Kenneth. An Introduction to the Phonetics of American English. New York: Ronald Press, 1947.

MLA (9th ed.) Citation

Thomas, Charles Kenneth. An Introduction to the Phonetics of American English. Ronald Press, 1947.

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