Barnett, A. Doak (Arthur Doak), author
Harper & Brathers, 1960
Buku Teks
Boyd, R.G.
Frederick A. Praeger , 1962
Buku Teks
Barnett, A. Doak (Arthur Doak), author
Frederick A. Praeger, 1962
Buku Teks
Lewis, John W., author
Cornell University Press, 1963
Buku Teks
Hinton, Harold C., author
Houghton Miffiln, 1966
Buku Teks