Gaya APA

Widmer, R, J, T, N, S., Hardjowisastro, S. (2001). Digital systems: principles and applications . New Jersey: Prentice Hall.

Gaya MLA

Widmer, Ronald, J., Tocci;, Neal, S.., Hardjowisastro, Setyoso. "Digital systems: principles and applications". New Jersey: Prentice Hall, 2001. Text.