Petrucci, R. H., & Harwood, W. S. (1997). General chemistry: Principles and modern applications (7th ed.). Prentice Hall.

Petrucci, Ralph H., and William S. Harwood. General Chemistry: Principles and Modern Applications. 7th ed. Upper Saddle River, N.J.: Prentice Hall, 1997.

Petrucci, Ralph H., and William S. Harwood. General Chemistry: Principles and Modern Applications. 7th ed. Prentice Hall, 1997.