December, John, author
Prenhalindo, 1997
Buku Teks
Adeela Arshad Ayaz, author
Fakultas Ilmu Tarbiyah dan Keguruan (FITK) UIN Syarif Hidayatullah , 2014
Artikel Jurnal
American Enterprise Institute for Public Policy Research, 1979
Buku Teks
Jun Kobayashi, author
Center for Asian and Pacific Studies, Seikei University, 2017
Artikel Jurnal
Youngman, Michael B.
McGraw-Hill , 1979
Buku Teks