Cita APA (7a ed.)

Bolinger, D. (1957). Interrogative structures of American English: (the direct questions). University of Alabama Press.

Cita Chicago Style (17a ed.)

Bolinger, Dwight. Interrogative Structures of American English: (the Direct Questions). Tuscaloosa: University of Alabama Press, 1957.

Cita MLA (9a ed.)

Bolinger, Dwight. Interrogative Structures of American English: (the Direct Questions). University of Alabama Press, 1957.