APA (7e ed.) Bronvermelding

Vande Vere, E. K. (1979). Rugged heart: The story of George I. Butler. Southern Publishing Association.

Chicago (17e ed.) Bronvermelding

Vande Vere, Emmett K. Rugged Heart: The Story of George I. Butler. Nashville, TN: Southern Publishing Association, 1979.

MLA (9e ed.) Bronvermelding

Vande Vere, Emmett K. Rugged Heart: The Story of George I. Butler. Southern Publishing Association, 1979.