Gaya APA
Chaffey, D., Hemphill, T. (2019).
Digital Business and E-Commerce Management (ed. tujuh).
United Kingdom:
Pearson Education Limited.
Gaya MLA
Chaffey, Dave., Hemphill, Tanya.
"Digital Business and E-Commerce Management".
ed. tujuh
United Kingdom:
Pearson Education Limited,
2019.
BUKU.