Gronroos, Cristian
Lexington Book6c1990, 0
Buku Teks
Lovelock, Christopher H., author
Pearson Education international, 2002
Buku Teks
Keller, kotler, author
Pearson Education, Inc, 2006
Buku Teks
Howard, John A., author
Richard D. Irwin, 1957
Buku Teks
Keegan, Warren J., author
Prentice Hall of India, 1982
Buku Teks