Artikel Jurnal
H. AbuBakar Busro
Ghalia Indonesia, 1991
Buku Teks
Abubakar Yacub
Ilmiyah, [date of publication not identified]
Koleksi Publik
Bowen, Howard R
Harper & Brothers, 1953
Buku Teks
Johnson, Walter H., author
Wiley blackwell, 2014
Buku Teks