Greenberg, D. (1973). "Announcing a new school.": A personal account of the beginnings of the Sudbury Valley School. Sudbury Valley School Press.
Chicago-referens (17:e uppl.)Greenberg, Daniel. "Announcing a New School.": A Personal Account of the Beginnings of the Sudbury Valley School. Framingham, Mass.: Sudbury Valley School Press, 1973.
MLA-referens (8:e uppl.)Greenberg, Daniel. "Announcing a New School.": A Personal Account of the Beginnings of the Sudbury Valley School. Sudbury Valley School Press, 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.