APA (7th ed.) Citation

Bolinger, D. (1957). Interrogative structures of American English: (The direct question). Univ. of Alabama Press.

Chicago Style (17th ed.) Citation

Bolinger, Dwight. Interrogative Structures of American English: (The Direct Question). University, Ala: Univ. of Alabama Press, 1957.

MLA (9th ed.) Citation

Bolinger, Dwight. Interrogative Structures of American English: (The Direct Question). Univ. of Alabama Press, 1957.