Não informado. (1952). Elementary school science bulletin. National Science Teachers Association.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Elementary School Science Bulletin. Washington: National Science Teachers Association, 1952.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Elementary School Science Bulletin. National Science Teachers Association, 1952.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.