Cahill, T. A. (1988). Folder 38: Compositional Studies of the Vinland Map, 1988. Saint Louis University Libraries Digitization Center.
Chicago-viite (17. p.)Cahill, Thomas A. Folder 38: Compositional Studies of the Vinland Map, 1988. Saint Louis University Libraries Digitization Center, 1988.
MLA-viite (8. p.)Cahill, Thomas A. Folder 38: Compositional Studies of the Vinland Map, 1988. Saint Louis University Libraries Digitization Center, 1988.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.