Hertzberg, Richard W.
Academic Press, 1980
Buku Teks
Gordon, M. Joseph
John Wiley & Sons, 2003
Buku Teks
Wordingham, J. A.
Littlefield, Adams & Co., 1967
Buku Referensi
American Society for Testing materials, 1959
Buku Teks
Gaylord, M.W.
Cahners Books, 1974
Buku Teks