Klein, Rudolf, author
Longman, 1983
Buku Teks
Walters, Vivienne J., author
Croom Helm, 1980
Buku Teks
Bone, Hugh A., author
University of Washington Press, 1958
Buku Teks
Andriyani Rahmah Fahriati, author
Faculty of Economics and Business State Islamic University (UIN) Syarif Hidayatullah, 2018
Artikel Jurnal
edited by Francis E. Rourke
Little, Brown, 1978
Buku Teks