Tocci, R. J., & Widmer, N. S. (2003). Sistem digit: Prinsip dan kegunaan (EDisi Kelapan.). Pearson Education Ltd..
Chicago Style (17th ed.) CitationTocci, Ronald J., and Neil S. Widmer. Sistem Digit: Prinsip Dan Kegunaan. EDisi Kelapan. England: Pearson Education Ltd., 2003.
MLA (9th ed.) CitationTocci, Ronald J., and Neil S. Widmer. Sistem Digit: Prinsip Dan Kegunaan. EDisi Kelapan. Pearson Education Ltd., 2003.
Warning: These citations may not always be 100% accurate.