APA (7th ed.) Citation

O'Brien, F. (1921). Mystic isles of the South Seas. Century.

Chicago Style (17th ed.) Citation

O'Brien, Frederick. Mystic Isles of the South Seas. New York: Century, 1921.

MLA (9th ed.) Citation

O'Brien, Frederick. Mystic Isles of the South Seas. Century, 1921.