The crusades,
by G. A. Campbell.
APA Citation
Campbell, G. A. (George Archibald). (1938). The crusades. New York: R. M. McBride & company.
MLA Citation
Campbell, G. A. (George Archibald), 1900-. The Crusades. New York: R. M. McBride & company, 1938.
Warning: These citations may not always be complete (especially for serials).