Natural law
 Buku Teks
Windolph, F. Lyman
Leviathan and natural law
Princeton University Press, 1951
 Buku Teks SO
Le Boutillier, Cornelia Geer
American democracy and natural law
Columbia University Press, 1950
 Buku Teks SO
Weinreb, Lloyd L.
Natural law and justice
Harvard University Press, 1987
 Buku Teks
Maritain, Facques
The rights of man and natural law
Charles Scribner's Son's, 1943
 Buku Teks