Gaya APA
Sholihin,Riadhus, .
(2019).
Digital Marketing Di Era 4.0
.
Yogyakarta:
penerbit Quadrant.
Gaya MLA
Sholihin,Riadhus, .
"Digital Marketing Di Era 4.0".
Yogyakarta:
penerbit Quadrant,
2019.
Text.