Streusand, Douglas E, author
Westview Press, 2011
Buku Teks
Mitchell, Mairin, author
Sidgwick and Jackson, 1949
Buku Teks
Progress , 1965
Buku Teks
Hanioglu, M. Sükrü, author
Princeton univ. press, 2010
Buku Teks
Jabbar, Muhammad Abdul
University of Malaya Press, 1981
Buku Teks