Não informado. (2011). Work Study & Management Services. Institute of Practitioners in Work Study, Organization and Methods.
Chicago-referens (17:e uppl.)Não informado. Work Study & Management Services. Middlesex, Inglaterra: Institute of Practitioners in Work Study, Organization and Methods, 2011.
MLA-referens (8:e uppl.)Não informado. Work Study & Management Services. Institute of Practitioners in Work Study, Organization and Methods, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.