Biskind, Elliott L.
Clark Boardman, 1971
Buku Teks SO
Statsky, William P., 1943-
West Publishing, 1977
Buku Teks SO
Brand, Norman
St. Martin's Press, 1994
Buku Teks SO
Brand, Norman
St.Martin`s Press, 1976
Buku Teks SO
Ray, Mary Barnard
Thomson West, 2008
Buku Teks SO