Challoner, J. (2000). Jendela IPTEK: V. 5.: Energi. Saint Joseph's University.
Lua i Stíl Chicago (17ú heag.)Challoner, Jack. Jendela IPTEK: V. 5.: Energi. Saint Joseph's University, 2000.
Lua MLA (8ú heag.)Challoner, Jack. Jendela IPTEK: V. 5.: Energi. Saint Joseph's University, 2000.
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