1. Introduction to Measurement Theory;Allen,1979
2. On choosing the appropriate measure of association when analyzing rating scale data;Babakus;J. Acad. Market. Sci.,1988
3. Appendix A: Tables of the Normal Curve. Applied Multivariate Analysis;Bernstein,1988
4. Karl Pearson and the correlation curve;Blyth;Int. Stat. Rev.,1994
5. Technique for analyzing overlapping memberships;Bonacich;Socio. Methodol.,1972