Krieger, P. J. (1999). Understanding chemical principals a learning companion. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Krieger, Peter J. Understanding Chemical Principals a Learning Companion. Upper Saddle River, New Jersey: Prentice-Hall, 1999.
Lua MLA (9ú heag.)Krieger, Peter J. Understanding Chemical Principals a Learning Companion. Prentice-Hall, 1999.
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