Cita APA (7a ed.)

Collins, B., Barrows, H. H., Putnam Parker, E., & Sorensen, C. W. (1951). The American continents. Silver Burdett.

Cita Chicago Style (17a ed.)

Collins, Beatrice, Harlan H. Barrows, Edith Putnam Parker, y Clarence Woodrow Sorensen. The American Continents. New York [u.a.]: Silver Burdett, 1951.

Cita MLA (9a ed.)

Collins, Beatrice, et al. The American Continents. Silver Burdett, 1951.