Gaya APA

Purba9, A, R., Purba, A, R. (2017). I'M Proud To Be An Oil Palm Breeder . Medan: media Perkebunan.

Gaya MLA

Purba9, Adbul, Razak., Purba, Adbul, Razak. "I'M Proud To Be An Oil Palm Breeder". Medan: media Perkebunan, 2017. Text.