Kaiser, Edward John, author
Buku Teks
Chapin, F. Stuart (Francis Stuart), 1916-, author
University of Illinois Press, 1979
Buku Teks
Chusnul Mariyah, author
1998
Artikel Jurnal
Kaiser, Edward John, author
University of Illinois Press, 1995
Buku Teks
Marsh, William M., author
McGraw-Hill, 1978
Buku Teks