Cita APA (7th ed.)

Krieger, P. J. (1999). Understanding chemical principals a learning companion. Prentice-Hall.

Cita Chicago (17th ed.)

Krieger, Peter J. Understanding Chemical Principals a Learning Companion. Upper Saddle River, New Jersey: Prentice-Hall, 1999.

Cita MLA (9th ed.)

Krieger, Peter J. Understanding Chemical Principals a Learning Companion. Prentice-Hall, 1999.