Farida Jasfar
Ghalia Indonesia, 2005
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Lovelock, Christopher H.
Indeks, 2005
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Buchari Alma
Alfabeta , 2014
Buku Teks SO
Trisakti International Center for Service studies FE-Usakti, 2006
Majalah, Jurnal, Buletin
Buchari Alma
Alfabeta, 2007
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