Creative Educational Society (Mankato, Minn.). (1971). Forces of nature.
Chicago-viite (17. p.)Creative Educational Society (Mankato, Minn.). Forces of Nature. Mankato, Minn, 1971.
MLA-viite (8. p.)Creative Educational Society (Mankato, Minn.). Forces of Nature. 1971.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.