Allen, Edward, author
John Wiley & Sons, 1999
Buku Teks
Allen, Edward, author
Wiley , 2014
Buku Teks
Waddell, Joseph J., author
McGraw-Hill, 1985
Buku Referensi
Hardie, Glenn M., author
Prentice-Hall, 1995
Buku Teks
Taylor, G.D.
Longman, 1985
Buku Teks