Artikel Jurnal
Sitompul, Zulkarnain, author
[publisher not identified], [date of publication not identified]
Buku Teks
Camcam Samsudin, author
Universitas Indonesia, 2000
UI - Tesis (Membership)
Dara Narulita, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2015
UI - Skripsi (Membership)
Artikel Jurnal