Cambridge : The President and Fellows of Harvard College
Majalah, Jurnal, Buletin
Beekman, George
Pretince Hall, 2002
Buku Teks SO
Schwartz, Mel M.
ASM International, 1990
Buku Teks SO
edited by Robert O. Parmley
McGraw-Hill, 1997
Buku Referensi
Robert O. Parmley, editor-in-chief
McGraw-Hill, 1989
Buku Referensi