National Science Teachers Association & US Dept. of Energy. (1977). Community workers and the energy they use: Grade 2. The Office.
Citace podle Chicago (17th ed.)National Science Teachers Association a US Dept. of Energy. Community Workers and the Energy They Use: Grade 2. Washington: The Office, 1977.
Citace podle MLA (9th ed.)National Science Teachers Association a US Dept. of Energy. Community Workers and the Energy They Use: Grade 2. The Office, 1977.
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