Weisman, Herman M.
Charles E. Merrill Publishing Company, 1980
Buku Teks
John Wiley & Sons, 1999
Buku Teks
Roze, Maris
Prentice-Hall, 2002
Buku Teks
Eisenberg, Anne
McGraw-Hill, 1992
Buku Teks
Rathbone, Robert R.
Addison-Wesley Publishing Company, 1985
Buku Teks