European Association of National Productivity Centres. (1973). Productivity measurement papers presented to a meeting of the development problems working group of the European Association of National Productivity Centres (Athens, October 17-20, 1972). Greek productivity centres.
Παραπομπή σε μορφή Chicago (17η εκδ.)European Association of National Productivity Centres. Productivity Measurement Papers Presented to a Meeting of the Development Problems Working Group of the European Association of National Productivity Centres (Athens, October 17-20, 1972). Athens: Greek productivity centres, 1973.
Παραπομπή σε μορφή MLA (9th εκδ.)European Association of National Productivity Centres. Productivity Measurement Papers Presented to a Meeting of the Development Problems Working Group of the European Association of National Productivity Centres (Athens, October 17-20, 1972). Greek productivity centres, 1973.