Tracey, Richard R.S., author
Butterworth, 1975
Buku Teks
Scheb, John M., author
Thomson Wadworth, 2005
Buku Teks
Rogier, L.J.J., author
2005
Artikel Jurnal
Breyer, Stephen G., 1938-, author
Little, Brown, 1982
Buku Teks
Breyer, Stephen G., 1938-, author
Little, Brown and Company, 1979
Buku Teks