Gaya APA
Wirtz, J., Lovelock, C. (2007).
Services marketing : People, Technology, Strategy .
Canada:
Pearson Prentice Hall=.
Gaya MLA
Wirtz, Jochen., Lovelock, Christoper.
"Services marketing : People, Technology, Strategy".
Canada:
Pearson Prentice Hall=,
2007.
Text.