Tracy, G. R., Friedl, A. E., & Trapp, H. E. (1979). Modern physical science. Holt.
Lua i Stíl Chicago (17ú heag.)Tracy, George R., Alfred E. Friedl, agus Harry E. Trapp. Modern Physical Science. New York: Holt, 1979.
Lua MLA (9ú heag.)Tracy, George R., et al. Modern Physical Science. Holt, 1979.
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