Não informado. (1963). Training directors journal. American Society of Training Directors.
Chicago-referens (17:e uppl.)Não informado. Training Directors Journal. Alexandria, Va: American Society of Training Directors, 1963.
MLA-referens (8:e uppl.)Não informado. Training Directors Journal. American Society of Training Directors, 1963.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.