International Association of Educators. International journal of progressive education. International Association of Educators.
Chicago-referens (17:e uppl.)International Association of Educators. International Journal of Progressive Education. Urbana, Ill.: International Association of Educators.
MLA-referens (9:e uppl.)International Association of Educators. International Journal of Progressive Education. International Association of Educators.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.