McGowan, R. A. (1931). Europe and the United States: Elements in Their Relationship. Washington, D.C..
Chicago-referens (17:e uppl.)McGowan, Raymond Augustus. Europe and the United States: Elements in Their Relationship. Washington, D.C., 1931.
MLA-referens (8:e uppl.)McGowan, Raymond Augustus. Europe and the United States: Elements in Their Relationship. Washington, D.C., 1931.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.