Cowdrick, J. C. (1889). The mountain graybeards: Or, Old Riddle's greatest riddle. The story of a town with a mystery. Beadle & Adams.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (8ú heag.)Cowdrick, Jesse C. The Mountain Graybeards: Or, Old Riddle's Greatest Riddle. The Story of a Town with a Mystery. Beadle & Adams, 1889.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.