Hepler, L. G. (1964). Chemical principles. Blaisedell.
Lua i Stíl Chicago (17ú heag.)Hepler, Loren G. Chemical Principles. New York: Blaisedell, 1964.
Lua MLA (9ú heag.)Hepler, Loren G. Chemical Principles. Blaisedell, 1964.
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