Allen, T. T. (2010) Introduction to Engineering Statistics and Lean
Six Sigma - Statistical Quality Control and Design of Experiments and
Systems (Second Edition ed.). London: Springer.
Box, G. (1991). Teaching engineers experimental design with
a paper helicopter. Report 76, Center for Quality and
Productivity Improvement. University of Wisconsin.Cano, Emilio L., Moguerza, Javier M. and Redchuk, Andrés. 2012.
Six Sigma with R. Statistical Engineering for Process
Improvement, Use R!, vol. 36. Springer, New York.
http://www.springer.com/statistics/book/978-1-4614-3651-5.
#' Cano, Emilio L., Moguerza, Javier M. and Prieto Corcoba, Andrés. 2015.
Quality Control with R. An ISO Standards approach, Use R!, Springer, New York.
Chambers, J. M. (2008) Software for data analysis. Programming with
R New York: Springer.
Montgomery, DC (2008) Introduction to Statistical Quality Control
(Sixth Edition). New York: Wiley&Sons
Wikipedia, http://en.wikipedia.org/wiki/Six_Sigma