APA (7e ed.) Bronvermelding

Watkins, J. E. (1919). Famous mysteries: Curious and fantastic riddles of human life that have never been solved. John C. Winston Co..

Chicago (17e ed.) Bronvermelding

Watkins, John Elfreth. Famous Mysteries: Curious and Fantastic Riddles of Human Life That Have Never Been Solved. Philadelphia: John C. Winston Co., 1919.

MLA (8e ed.) Bronvermelding

Watkins, John Elfreth. Famous Mysteries: Curious and Fantastic Riddles of Human Life That Have Never Been Solved. John C. Winston Co., 1919.