Robbins, Sydney M.
Houghton Miffiln, 1954
Buku Teks
Ratner, David L., author
West Publishing, 1992
Buku Teks
Ratner, David L., author
West Publishing, 1996
Buku Teks
Bloomenthal, Harold S., author
Little, Brown, 1977
Buku Teks
edited by Ernest L. Folk
Sage Hill, 1971
Buku Teks