Não informado. (1937). The Science teacher. American Science Teachers Association.
Chicago-referens (17:e uppl.)Não informado. The Science Teacher. Normal, Ill: American Science Teachers Association, 1937.
MLA-referens (8:e uppl.)Não informado. The Science Teacher. American Science Teachers Association, 1937.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.