References
- Bailey , M. 1978 . “The Analysis of Sequential Structures in Educational Data” , Sydney : Macquarie University . Unpublished doctoral dissertation
- Cuttman , L. 1944 . “A Basis for Scaling Qualitative Data” . American Sociological Review , 9 : 139 – 150 .
- Krus , D. J. , Bart , W. M. and Airasian , P. W. 1975 . Ordering Theory and Methods , Los Angeles : Theta Press .
- Richmond , James M. and Morgan , Richard F. 1977 . A National Survey of the Environmental Knowledge and Attitudes of Fifth Year Pupils in England , Columbus, Ohio : ERIC/SMEAC Information Reference Center .