Shoppell, R. W. Latest descriptive price list of Shoppell's modern house designs. Co-operative Building Plan Association.
Chicago-referens (17:e uppl.)Shoppell, R. W. Latest Descriptive Price List of Shoppell's Modern House Designs. New York: Co-operative Building Plan Association.
MLA-referens (8:e uppl.)Shoppell, R. W. Latest Descriptive Price List of Shoppell's Modern House Designs. Co-operative Building Plan Association.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.