APA (7th ed.) Citation

Bradford, E. (1973). Christopher Columbus / (by) Ernle Bradford. Joseph.

Chicago Style (17th ed.) Citation

Bradford, Ernle. Christopher Columbus / (by) Ernle Bradford. London: Joseph, 1973.

MLA (9th ed.) Citation

Bradford, Ernle. Christopher Columbus / (by) Ernle Bradford. Joseph, 1973.

Warning: These citations may not always be 100% accurate.