APA (7th ed.) Citation

Whittaker, F. (1887). The twin horsemen. Beadle and Adams.

Chicago Style (17th ed.) Citation

Whittaker, Frederick. The Twin Horsemen. New York: Beadle and Adams, 1887.

MLA (9th ed.) Citation

Whittaker, Frederick. The Twin Horsemen. Beadle and Adams, 1887.

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