Almond, Gabriel A., author
Bombay Vakils, Effer and Simont 1966,
Buku Teks
Vanderbilt University Press, 1960
Buku Teks
Wyatt, Woodrow W.
D.C. Heath , 1967
Buku Teks
Highsmith, Richard M., Jr.
J.B.Lippincott Co., 1963
Buku Teks
Boyd Jr., Harper W.
Richard D. Irwin Inc , 1958
Buku Teks