Gaya APA
Lovelock, C., Wirtz, J. (2018).
Essentails of Services Marketing 3rd Edition .
England:
Pearson Education Limited.
Gaya MLA
Lovelock, Christopher., Wirtz, Jochen.
"Essentails of Services Marketing 3rd Edition".
England:
Pearson Education Limited,
2018.
eBook.