Gaya APA

Edward, C, -, P., Ward, J. (2001). The Essence of Information Systems Sistem Informasi (Ed. 1). Yogyakarta: Andi.

Gaya MLA

Edward, Chris, -, P., Ward, John. "The Essence of Information Systems Sistem Informasi". Ed. 1 Yogyakarta: Andi, 2001. Text.