Cunningham, James P., author
Kogan Page, 1973
Buku Teks
Cabanellas, Guillermo, author
VCH, 1991
Buku Teks
edited by D. J. Gijlstra and D. F. Murphy
Kluwer, 1984
Buku Teks
Taylor, Paul M.
Sweet &Maxwell, 1999
Buku Teks
Mason, Peter, author
Routledge, 1998
Buku Teks