Não informado. (1928). Journal of Education for Business. Heldref Publications.
Chicago-viite (17. p.)Não informado. Journal of Education for Business. Washington: Heldref Publications, 1928.
MLA-viite (8. p.)Não informado. Journal of Education for Business. Heldref Publications, 1928.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.