Chicago: "Preamble," Democratic Party Platform of 1940 in Donald B. Johnson, Ed. National Party Platforms, 1840–1976. Supplement 1980. (Champaign-Urbana: University of Illinois), P.381 Original Sources, accessed April 6, 2025, http://originalsources.com/Document.aspx?DocID=LSQELWE9EYJP4M5.
MLA: . "Preamble." Democratic Party Platform of 1940, in Donald B. Johnson, Ed. National Party Platforms, 1840–1976. Supplement 1980. (Champaign-Urbana: University of Illinois), P.381, Original Sources. 6 Apr. 2025. http://originalsources.com/Document.aspx?DocID=LSQELWE9EYJP4M5.
Harvard: , 'Preamble' in Democratic Party Platform of 1940. cited in , Donald B. Johnson, Ed. National Party Platforms, 1840–1976. Supplement 1980. (Champaign-Urbana: University of Illinois), P.381. Original Sources, retrieved 6 April 2025, from http://originalsources.com/Document.aspx?DocID=LSQELWE9EYJP4M5.