Mayers, Lewis
Harper & Brothers, 1955
Buku Teks
Schwartz, Bernard, author
Clarendon Press Oxford, 1972
Buku Teks
American Bar Association Press, 1981
Buku Teks
Farnsworth, E. Allan, author
Oceana Publication, 1983
Buku Teks
Haviland, H. Field, author
The Brooking Institution, 1960
Buku Teks