Gaya APA

DKK, R, T. (2017). KOPERASI = HOW TO GROW AND SUSTAIN (1). JAKARTA: ELEX MEDIA KOMPUTINDO.

Gaya MLA

DKK, ROBBY, TULUS. "KOPERASI = HOW TO GROW AND SUSTAIN". 1 JAKARTA: ELEX MEDIA KOMPUTINDO, 2017. Text.