Não informado. (1928). Journal of Education for Business. Heldref Publications.
Chicago-referens (17:e uppl.)Não informado. Journal of Education for Business. Washington: Heldref Publications, 1928.
MLA-referens (8:e uppl.)Não informado. Journal of Education for Business. Heldref Publications, 1928.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.