Shoppell, R. W. Latest descriptive price list of Shoppell's modern house designs. Co-operative Building Plan Association.
Chicago-viite (17. p.)Shoppell, R. W. Latest Descriptive Price List of Shoppell's Modern House Designs. New York: Co-operative Building Plan Association.
MLA-viite (8. p.)Shoppell, R. W. Latest Descriptive Price List of Shoppell's Modern House Designs. Co-operative Building Plan Association.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.