Edelstein, Michael R.
Westview Press , 1993
Buku Teks
Ussher, Jane M., author
Harvester Wheatsheaf, 1991
Buku Teks
Dimond, Margaret, author
Appleton, Century, 1983
Buku Teks
Bond, John
Churchill Livinstone , 1994
Buku Teks
McMurray, Anne, author
Harcourt Mosby, 1999
Buku Teks