Population Center Foundation. Population Data Information Service. (1977). Catalogue of research abstracts, number two. Population Information Division.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPopulation Center Foundation. Population Data Information Service. Catalogue of Research Abstracts, Number Two. Manila: Population Information Division, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPopulation Center Foundation. Population Data Information Service. Catalogue of Research Abstracts, Number Two. Population Information Division, 1977.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.