Berle, Adolf A., Jr., author
Harper & Row, [1962]
Buku Teks
Crawford, William R., author
Frederick A. Praeger, 1961
Buku Teks
Stuart, Graham H. (Graham Henry), 1887-, author
Appleton-Century-Crofts, 1955
Buku Teks
edited by Eduardo P. Archetti
MacMillan Education, 1987
Buku Teks
Westview Press, 1984
Buku Teks