Barrows, H. H., & Putnam Parker, E. United States and Canada.
Cita Chicago (17th ed.)Barrows, Harlan H., i Edith Putnam Parker. United States and Canada.
Cita MLA (8th ed.)Barrows, Harlan H., i Edith Putnam Parker. United States and Canada.
Atenció: Aquestes cites poden no estar 100% correctes.