Gellhorn, Ernest, author
West, 2004
Buku Teks
Leslie, Douglas L., author
West Publishing, 1992
Buku Teks
Champion, Walter T, author
WEST , 2009
Buku Teks
Podgor, Ellen S., author
West Publishing, 1993
Buku Teks
Gellhorn, Ernest, author
West Publishing Company, 1972
Buku Teks