Williamson, J. Peter (John Peter), author
Scott, Foresman, 1968
Buku Teks
Burke, Karen C., 1951-, author
West Publishing, 1992
Buku Teks
Bittker, Boris I., author
Brown, 1984
Buku Teks
Mcnulty, John K., author
west Publishing, 1989
Buku Teks
Mcnulty, John K., author
West Publishing, 1994
Buku Teks