Tocci, R. J., & Widmer, N. S. (2001). Digital systems: Principles and applications (8th ed.). Prentice Hall.

Tocci, Ronald J., and Neal S. Widmer. Digital Systems: Principles and Applications. 8th ed. Upper Saddle River, N.J.: Prentice Hall, 2001.

Tocci, Ronald J., and Neal S. Widmer. Digital Systems: Principles and Applications. 8th ed. Prentice Hall, 2001.