APA (7th ed.) Citation

Dahl, H. (1979). Word frequencies of spoken American English. Verbatim.

Chicago Style (17th ed.) Citation

Dahl, Hartvig. Word Frequencies of Spoken American English. Detroit, Mich: Verbatim, 1979.

MLA (9th ed.) Citation

Dahl, Hartvig. Word Frequencies of Spoken American English. Verbatim, 1979.