Legum, Colin
Frederick A. Praeger, 1964
Buku Teks SO
edited by Michael M. Horowitz and Thomas M. Painter
Westview Press, 1986
Buku Teks SO
John Doling, Roziah Omar
Ashgate, 2000
Buku Teks
Delavignette, Robert Louis
Oxford University Press, 1950
Buku Teks
Rivkin, Arnold
Frederick A. Praeger, 1962
Buku Teks SO