Cita APA

Gardner, L. C. 1., & O'Neill, W. L. (1974). Looking backward: Reintroduction to American history. New York: McGraw-Hill Book Company.

Citación estilo Chicago

Gardner, Lloyd C. 1934-, y William L. O'Neill. Looking Backward: Reintroduction to American History. New York: McGraw-Hill Book Company, 1974.

Cita MLA

Gardner, Lloyd C. 1934-, y William L. O'Neill. Looking Backward: Reintroduction to American History. New York: McGraw-Hill Book Company, 1974.