APA

Gabriel R. H., . (1942). Main Currents in American History. New York: D . Appleton - Century Co , Inc.

Chicago

Gabriel Ralph H, . 1942. Main Currents in American History. New York: D . Appleton - Century Co , Inc.

Harvard

Gabriel R. H., . (1942). Main Currents in American History. New York: D . Appleton - Century Co , Inc.

MLA

Gabriel Ralph H, . Main Currents in American History. New York: D . Appleton - Century Co , Inc. 1942.