Norman, Sandy, author
Facet Publishing, 2004
Buku Teks
Frederiksen, Linda, author
Elsevier Ltd.,, 2016
Buku Teks
Gorman, G.E., author
Facet Publishing, 2005
Buku Teks
Thorn, Eric A., author
Jay Books, 1989
Buku Referensi
Strong, William S., author
MIT Press, 1981
Buku Teks