Não informado. (1963). Bulletin of the Oxford University Institute of Economics & Statistics. Oxford University Institute of Economics and Statistics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Oxford University Institute of Economics & Statistics. Oxford, Inglaterra: Oxford University Institute of Economics and Statistics, 1963.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Oxford University Institute of Economics & Statistics. Oxford University Institute of Economics and Statistics, 1963.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.