Gaya APA

Puryani, ., Ristono, A. (2012). Penelitian Operasional (Ed.1, Cet.1). Yogyakarta: Graha Ilmu.

Gaya MLA

Puryani, ., Ristono, Agus. "Penelitian Operasional". Ed.1, Cet.1 Yogyakarta: Graha Ilmu, 2012. Textbook.