Thurber, Glarence E
Duke University Press, 1973
Buku Teks
Moore, Wilbert E. (Wilbert Ellis), author
Cornell University Press , 1951
Buku Teks
Teichert, Pedro C.M., author
Bureau of Business Research Mississippi University , 1959
Buku Teks
Merryman, John Henry, author
Stanford Studies in Law and Development, 1979
Buku Teks
edited by E.K. Fisk
Australia National University, 1966
Buku Teks