Não informado. (1948). Education. Department of Education, School Publications Branch.
Chicago-referens (17:e uppl.)Não informado. Education. Wellington: Department of Education, School Publications Branch, 1948.
MLA-referens (8:e uppl.)Não informado. Education. Department of Education, School Publications Branch, 1948.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.