@book {Tabachnick2007, title = {Using Multivariate Statistics}, year = {2007}, pages = {XXVIII, 980 p. : ill.}, publisher = {Pearson/A \& B}, organization = {Pearson/A \& B}, edition = {7}, address = {Boston ; Montreal}, issn = {9780205459384}, author = {Tabachnick, Barbara G and Fidell, Linda S} }