Stewart, Kenneth G., author
Thomson Broocks, 2005
Buku Teks
Stremler, Ferrel G.
Addison-Wesley, 1982
Buku Teks
Hays, David G.
American Elsevier puvlishing, 1967
Buku Teks
Wilcocks, Charles
Oxford University Press, 1950
Buku Teks
Hill, W. F., author
Garden Art Press, 1995
Buku Referensi