Não informado. (1971). International journal of continuing education and training. Baywood Publishing.
Chicago-referens (17:e uppl.)Não informado. International Journal of Continuing Education and Training. Farmingdale, NY: Baywood Publishing, 1971.
MLA-referens (8:e uppl.)Não informado. International Journal of Continuing Education and Training. Baywood Publishing, 1971.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.