Lindberg, L. (1954). The democratic classroom: A guide for teachers. Bureau of Publications, Teachers College, Columbia University.
Chicago-viite (17. p.)Lindberg, Lucile. The Democratic Classroom: A Guide for Teachers. New York: Bureau of Publications, Teachers College, Columbia University, 1954.
MLA-viite (8. p.)Lindberg, Lucile. The Democratic Classroom: A Guide for Teachers. Bureau of Publications, Teachers College, Columbia University, 1954.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.