Squires, Lynn B.
West Publishing, 1982
Buku Teks
Ray, Mary Barnard
Thomson West, 2008
Buku Teks SO
Ray, Mary Barnard
Thomson West, 2006
Buku Teks SO
Cohen, Morris L.
[Publisher not identified], 1992
Buku Teks SO
Cohen, Morris L.
West Publishing, 1968
Buku Teks SO