Meiere, H. (1949). Letter to Arno Heuduck, September 18, 1949. Saint Louis University Libraries Digitization Center.
Chicago-viite (17. p.)Meiere, Hildreth. Letter to Arno Heuduck, September 18, 1949. Saint Louis University Libraries Digitization Center, 1949.
MLA-viite (8. p.)Meiere, Hildreth. Letter to Arno Heuduck, September 18, 1949. Saint Louis University Libraries Digitization Center, 1949.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.