Davies, Douglas, 1942-, author
The Guilford Press, 2004
Buku Teks
Fietta, Stephen, author
Oxford University Press, 2016
Buku Teks
Clements, John, 1946-, author
John Wiley & Sons, 1994
Buku Teks
Pedley, Paul, author
Facet Publishing, 2005
Buku Teks
Blanco, Luis Ortiz
Clarendon Press, 1996
Buku Teks