Schwartz, Bernard
McGraw-Hill, 1974
Buku Teks SO
Lurie, Jonathan
Alfred A.Knopf, 1983
Buku Teks
Hall, Kermit L.
Oxford University Press, 1989
Buku Teks
Gilmore, Grant
Yale University Press, 1977
Buku Teks SO
Kempin, Frederick G
West Publishing Co, 1973
Buku Teks SO