Hales, Michael G.
Prentice-Hall, 198
Buku Teks
Prosser, William L., author
West Publishing, 1971
Buku Teks
Ross, Martin J., author
A Fawcett Crest Book, 1975
Buku Teks
Gary Joseph, Georgina Carson, Phyllis Brodkin, William Abbott, Geuffrey Wells
Carswell, 2011
Buku Referensi
Frans von der Dunk, Fabio Tronchetti, editor
Edward Elgar Publishing, 2015
Buku Teks