APA-referens (7:e uppl.)

Cowdrick, J. C. (1889). The mountain graybeards: Or, Old Riddle's greatest riddle. The story of a town with a mystery. Beadle & Adams.

Chicago-referens (17:e uppl.)

Cowdrick, Jesse C. The Mountain Graybeards: Or, Old Riddle's Greatest Riddle. The Story of a Town with a Mystery. New York: Beadle & Adams, 1889.

MLA-referens (8:e uppl.)

Cowdrick, Jesse C. The Mountain Graybeards: Or, Old Riddle's Greatest Riddle. The Story of a Town with a Mystery. Beadle & Adams, 1889.