* Tabachnick, B.G.; Fidell, L.S. (2007). ''Using Multivariate Statistics, 5th Edition''. Boston: Pearson Education, Inc. / Allyn and Bacon, {{ISBN|978-0-205-45938-4}} | * Tabachnick, B.G.; Fidell, L.S. (2007). ''Using Multivariate Statistics, 5th Edition''. Boston: Pearson Education, Inc. / Allyn and Bacon, {{ISBN|978-0-205-45938-4}} |