tinbergen, j. (1962). the appraisal of investment projects: The semi input- output method. the institute of national planning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रtinbergen, jan. The Appraisal of Investment Projects: The Semi Input- Output Method. cairo: the institute of national planning, 1962.
एमएलए (9वां संस्करण) प्रशस्ति पत्रtinbergen, jan. The Appraisal of Investment Projects: The Semi Input- Output Method. the institute of national planning, 1962.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.