@book{hair2006multivariate,
  author = {Hair, Joseph F. and Black, William C. and Babin, Barry J. and Anderson, Rolph E.},
  interhash = {aa7e924c7ed64801ab814448f17402db},
  intrahash = {ffeaff51fa312872b95bbe1bad79e031},
  note = {No.4},
  title = {Multivariate Data Analysis},
  volume = 7,
  year = 2006
}