Gregg, D. C. (1958). Principles of chemistry. Allyn and Bacon.
Cita Chicago (17th ed.)Gregg, Donald Crowther. Principles of Chemistry. Boston: Allyn and Bacon, 1958.
Cita MLA (9th ed.)Gregg, Donald Crowther. Principles of Chemistry. Allyn and Bacon, 1958.
Atenció: Aquestes cites poden no estar 100% correctes.