Freedman, M. David, author
John Wiley & Sons, 1972
Buku Teks
Malvino, Albert Paul, author
Tata McGraw-Hill, 1981
Buku Teks
Murray, William D., author
Prentice-Hall, 1990
Buku Teks
Rockport Publisher, 1997
Buku Referensi
Pai, M.A., author
Tata McGraw-Hill, 1979
Buku Teks