Worley, Nancy K.
Mosby, 1997
Buku Teks SO
Collins, Charles
Oxford University Press, 1994
Buku Teks
Morgan, Arthur James
Morgan/Morene, 1973
Buku Teks SO
edited by John Monahan
Pergamon Press, 1976
Buku Teks
Lancaster, Jeanette
Mosby, 1980
Buku Teks SO