Lusk, Harold F., 1893-, author
Richard D. Irwin, 1969
Buku Teks
Keeton, Page, author
West Pub., 1971
Buku Teks
Thampapillai, Dilan, author
Oxford University Press, 2011
Buku Teks
Lunney, glynn, author
West, 2010
Buku Teks
Dine, Janet, author
Blackstone Press, 1998
Buku Referensi