Wilson, Edmund, 1895-1972, author
Doubleday & Co., 1972
Buku Teks
Varley, H. Paul
Praegar Publisher , 1973
Buku Teks
Alexandrova, Vera
Doubleday & Company, Inc., 1963
Buku Teks
Khaldun, Ibn, author
Pantheon Book, 1958
Buku Teks
Ibnu Khaldun, author
Routledge & Kegan Paul, 1958
Buku Teks