Boyd, R.G.
Frederick A. Praeger , 1962
Buku Teks
Barnett, Arthur Doak
Frederick A. Praeger, 1962
Buku Teks
Lewis, John W.
Cornell University Press, 1963
Buku Teks
Hinton, Harold C.
Houghton Miffiln, 1966
Buku Teks
Buck, John Lossing, 1890-1975
Frederick A. Praeger , 1966
Buku Teks