Journal of youth services in libraries
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Lovelock, Christopher H.
Services marketing
Prentice-Hall, 1960
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Zeithaml, Valarie A.
Services marketing
The McGraw-Hill , 1996
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Lovelock, Christopher H.
Services marketing
Pearson Prentice Hall, 2001
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Lovelock, Christopher H.
Services marketing
Prentice-Hall, 2000
 Buku Teks