Goss, David
Routledge, 1991
Buku Teks
Goss, David
Taylor and Francis, 1995
Buku Teks
McGuire, Joseph W., author
McGraw-Hill, 1963
Buku Teks
Epstein, Lita, author
John Wiley & Sons, 2009
Buku Teks
Hancock, William A., author
McGraw-Hill, 1982
Buku Teks