APA (7th ed.) Citation

TOCCI, R. J., & WIDMER, N. S. (1998). Digital systems: Principles and applications.-- ed.7. Prentice Hall.

Chicago Style (17th ed.) Citation

TOCCI, Ronald J., and Neal S. WIDMER. Digital Systems: Principles and Applications.-- Ed.7. London: Prentice Hall, 1998.

MLA (9th ed.) Citation

TOCCI, Ronald J., and Neal S. WIDMER. Digital Systems: Principles and Applications.-- Ed.7. Prentice Hall, 1998.