Gaya APA

Sholihin, R. (2019). Digital Marketing di Era 4.0 (Cet. 1). Yogyakarta, DIY: Quadrant.

Gaya MLA

Sholihin, Riadhus. "Digital Marketing di Era 4.0". Cet. 1 Yogyakarta, DIY: Quadrant, 2019. Text.