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
Finch, John
Introduction to legal theory
Sweet & Maxwell, 1974
 Buku Teks
Kelsen, Hans
Introduction to the problems of legal theory
Clarendon Press Oxford, 1992
 Buku Teks