Crawford, R.J., author
Pergamon Press, 1987
Buku Teks
Hertzberg, Richard W., author
Academic Press, 1980
Buku Teks
Gordon, M. Joseph, author
John Wiley & Sons, 2003
Buku Teks
Wordingham, J. A., author
Littlefield, Adams & Co., 1967
Buku Referensi
American Society for Testing materials, 1959
Buku Teks