Walker, Thomaw W.
Westview Press, 1986
Buku Teks
Shapcott, Thomas William, 1935-
University of Queensland Press, 1972
Koleksi Publik
Thomas, F. W.
University of Calcuta, 1942
Buku Teks
Wehr, Mentzer Russell
Addison-Wesley, 1985
Buku Teks
Bowden, Elbert V.
Alexander Hamilton Institute , 1962
Buku Teks