De Vrye, C. (1997). Good Service Is Good Bussiness 7 Simple Strategis For Succes. Jakarta: Gramedia Pustaka Utama.
Chicago Stili AlıntıDe Vrye, Catherine. Good Service Is Good Bussiness 7 Simple Strategis For Succes. Jakarta: Gramedia Pustaka Utama, 1997.
MLA AlıntıDe Vrye, Catherine. Good Service Is Good Bussiness 7 Simple Strategis For Succes. Jakarta: Gramedia Pustaka Utama, 1997.
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