Hughes, H. Stuart
Frentice Hall,, 1961
Buku Teks
Kutner, Peter B.
Greenwood Press , 1988
Buku Teks
Holmes, Oliver Wendell, Jr.
Little, Brown and Company, 1951
Buku Teks
Postema, Gerald J.
Clarendon Press, 1986
Buku Teks
Eisenberg, Melvin A.
Harvard University Press, 1988
Buku Teks