APA Style

Ristono, A., Puryani, . (2011). Penelitian Operasional Lanjut (Ed. 1, Cet. 1). Yogyakarta: Graha Ilmu.

MLA Style

Ristono, Agus., Puryani, . "Penelitian Operasional Lanjut". Ed. 1, Cet. 1 Yogyakarta: Graha Ilmu, 2011. Text.