1. 1M. T. Albanese, and M. Knott (1990 ) Twomiss: a computer program for fitting a one- or two-factor logit-probit latent variable model to binary data when observations may be missing . London School of Economics and Political Science, London.
2. 3D. J. Bartholomew, and M. Knott (1999 )Latent Variable Models and Factor Analysis, 2nd edn. London: Arnold.
3. 4A. Birnbaum (1968 ) Some latent trait models and their use in inferring an examinee's ability . InStatistical Theories of Mental Test Scores with Contributions by A. Birnbaum(eds F. M. Lord and M. R. Novick). Reading: Addison-Wesley.
4. 5D. Black, J. N. Morris, C. Smith, and P. Townsend (1982 ) The Black Report . InInequalities in Health(eds P. Townsend and N. Davidson). London: Penguin.