National Science Teachers Association & US Dept. of Energy. (1977). Community workers and the energy they use: Grade 2. The Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNational Science Teachers Association और US Dept. of Energy. Community Workers and the Energy They Use: Grade 2. Washington: The Office, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNational Science Teachers Association और US Dept. of Energy. Community Workers and the Energy They Use: Grade 2. The Office, 1977.
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