APA aipamena

Barrows, H. H., & Putnam Parker, E. United States and Canada.

Chicago Style aipamena

Barrows, Harlan H., and Edith Putnam Parker. United States and Canada.

MLA aipamena

Barrows, Harlan H., and Edith Putnam Parker. United States and Canada.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.