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Gaya APA

Gruber, I, S, K. (2013). Pengetahuan Sistem Kebutuhan Perangkat Lunak . Indonesia: Angkasa Bandung.

Gaya MLA

Gruber, Ing.Alois, Schonmetz,, Karl. "Pengetahuan Sistem Kebutuhan Perangkat Lunak". Indonesia: Angkasa Bandung, 2013. Text.