Cita APA (7a ed.)

Barrows, H. H., Putnam Parker, E., & Sorensen, C. W. (1953). Old world lands. Silver Burdett.

Cita Chicago Style (17a ed.)

Barrows, Harlan H., Edith Putnam Parker, y Clarence Woodrow Sorensen. Old World Lands. New York [u.a.]: Silver Burdett, 1953.

Cita MLA (9a ed.)

Barrows, Harlan H., et al. Old World Lands. Silver Burdett, 1953.