Herriott, Luke
Rockport publishers, Inc., 2009
Buku Referensi
Fakultas Filsafat Universitas Katolik Santo Thomas, 2002
Majalah, Jurnal, Buletin
Farrelly, Lorraine
Wiley-Academy, 2003
Buku Teks
Sussman, Art
Jossey-Bass , 2006
Buku Referensi
Simmons, Christopher, 1973-
Rockport Publishers, 2006
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