Bartholomew, David J. Latent variable models and factor analysis / by David J. Bartholomew, Martin Knott. - 2nd ed. - London, Eng. ; New York, N.Y. : Arnold : Oxford University Press, 1999. - xiii, 214 p. - Kendall's Library of Statistics 7. . Includes bibliographical refernces and index. ISBN: 034069243x