McGraw-Hill, [Date of publication not identified]
Buku Teks
Sylvia, Ronald D.
Harcourt College Publisher, 2002
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Christensen, C. Roland
Richard D. Irwin, 1980
Buku Teks SO
2009
Artikel Jurnal
Anton Yogasvara
Fakultas Ilmu Administrasi Universitas Indonesia, 2014
UI - Skripsi Membership