Heuduck, A. a. W. (1949). Letter to Gerdt Wagner also Letter in German to Paul Heuduck, Janurary 26, 1949 and January 23, 1948. Saint Louis University Libraries Digitization Center.
Citação do estilo Chicago (17ª ed.)Heuduck, Arno and Wagner. Letter to Gerdt Wagner Also Letter in German to Paul Heuduck, Janurary 26, 1949 and January 23, 1948. Saint Louis University Libraries Digitization Center, 1949.
Citação MLA (8ª ed.)Heuduck, Arno and Wagner. Letter to Gerdt Wagner Also Letter in German to Paul Heuduck, Janurary 26, 1949 and January 23, 1948. Saint Louis University Libraries Digitization Center, 1949.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.