Artikel Jurnal
Mahathir bin Mohamad, 1925-, author
Handal Niaga Pustaka , [date of publication not identified]
Buku Teks
Siregar, Hetty
Yakoma PGI, 1999
Buku Teks
Macleride, Sean, author
Balai Pustaka, 1983
Buku Teks
Budiyono, author
1992
UI - Skripsi (Membership)