Posner, Richard A.
The problematics of moral and legal theory
Harvard University Press, 2002
 Buku Teks
Friedmann, Wolfgang, 1907-1972
Legal theory
Stevens & Sons, 1949
 Buku Teks
Friedmann, Wolfgang, 1907-1972
Legal theory
Columbia University Press, 1967
 Buku Teks
Friedman, Milton, 1912-2006
Legal theory
Steven & Sons, 1953
 Buku Teks
Friedmann, Wolfgang, 1907-1972
Legal theory
Columbia University Press, 1960
 Buku Teks