Não informado. (2011). Work Study & Management Services. Institute of Practitioners in Work Study, Organization and Methods.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Work Study & Management Services. Middlesex, Inglaterra: Institute of Practitioners in Work Study, Organization and Methods, 2011.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Work Study & Management Services. Institute of Practitioners in Work Study, Organization and Methods, 2011.
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