Zim, H. S. (1953). Science for children and teachers. Association for Childhood Education International.
Chicago-referens (17:e uppl.)Zim, Herbert Spencer. Science for Children and Teachers. Washington: Association for Childhood Education International, 1953.
MLA-referens (9:e uppl.)Zim, Herbert Spencer. Science for Children and Teachers. Association for Childhood Education International, 1953.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.