Cita APA (7a ed.)

Davis, O. L., & Hunkins, F. P. (1971). Asking about the USA and its neighbors. American Book.

Cita Chicago Style (17a ed.)

Davis, Ozro Luke, y Francis P. Hunkins. Asking About the USA and Its Neighbors. New York [u.a.]: American Book, 1971.

Cita MLA (9a ed.)

Davis, Ozro Luke, y Francis P. Hunkins. Asking About the USA and Its Neighbors. American Book, 1971.