R.N. Bray, editor
Taylor and Francis, 2008
Buku Teks
edited by David F.S. Natusch and Philip K. Hopke
John Wiley & Sons, 1983
Buku Teks
Block, Marilyn R.
American Society for Quality, 1999
Buku Teks
Sethi, S. Prakash, author
Goodyear, 1973
Buku Teks
New York, N.Y. United Nations 1985,
Buku Teks