Não informado. (1967). History Teacher. Society for History Education.
Chicago-referens (17:e uppl.)Não informado. History Teacher. Long Beach, Calif: Society for History Education, 1967.
MLA-referens (8:e uppl.)Não informado. History Teacher. Society for History Education, 1967.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.