Garb, Gerald
Macmillan, 1981
Buku Teks
Hyman, David N.
Times Mirror/Mosby College, 1986
Buku Teks
Pashigian, B. Peter, author
McGraw-Hill, 1998
Buku Teks
O`Sullivan, Arthur, author
Pearson, 2010
Buku Teks
Cameron, Adrian Colin, author
Cambridge University Press, 2009
Buku Teks