Gaya APA
Kotler, P. et al (2017).
Marketig 4.0 :Moving from Traditional to Digital .
United State of America:
Acid-free paper.
Gaya MLA
Kotler, Philip. et al.
"Marketig 4.0 :Moving from Traditional to Digital".
United State of America:
Acid-free paper,
2017.
Buku.