Artikel Jurnal
Ari Tihar
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2009
UI - Tesis Open
Oemar Zainuddin
Ruas, 2010
Buku Teks SO
[Publisher not identified], [Date of publication not identified]
Naskah
[Publisher not identified], [Date of publication not identified]
Naskah