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Gaya APA
Sitinjak, T, J.(2013).Riset Operasi Untuk Pengambilan Keputusan Manajerial dengan Aplikasi Excel .Yogyakarta:Graha Ilmu.
Gaya MLA
Sitinjak, Tumpal, JR."Riset Operasi Untuk Pengambilan Keputusan Manajerial dengan Aplikasi Excel".Yogyakarta:Graha Ilmu,2013.Text.