Gaya APA

Tocci, R, J., Widmer, N, S. (2004). Digital systems: Principles and applications (9th ed). New Jersey: Pearson Education, Inc..

Gaya MLA

Tocci, Ronald, J.., Widmer, Neal, S.. "Digital systems: Principles and applications". 9th ed New Jersey: Pearson Education, Inc., 2004. Printed Book.