Elfiky, Ibrahim, author
Zaman, 2009
Buku Teks
Ibrahim Elfiky, author
Zaman, 2013
Buku Teks
Assandimitra Djojodipoero, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1982
UI - Skripsi (Membership)
Progress, 2004
Buku Teks
Carnegie, Dale
Pionir Jaya, [date of publication not identified]
Buku Teks