1. Society of Automotive Engineers: ARP5905
2. Tague , N.R.
The Quality Toolbox 2nd Wisconsin ASQC Quality Press 1995
3. Ide , R.F. and
Sheldon , D.W.
2008
4. Steen , L.E. ,
Ide , R.F. ,
Van Zante , J.F. , and
Acosta , W.J.
2015
5. Science Engineering Associates
2016 http://www.scieng.com/