Cita APA (7th ed.)

Hepler, L. G. Principlles of Chemistry.

Cita Chicago (17th ed.)

Hepler, Loren G.Smith. Principlles of Chemistry.

Cita MLA (8th ed.)

Hepler, Loren G.Smith. Principlles of Chemistry.

Atenció: Aquestes cites poden no estar 100% correctes.