D. McDowall, R. McCleary, E. Meidinger, and R. Jr.. Sage university papers; Series: Quantitative applications in the social sciences; 21 Sage Publications, Inc., (1983)
C. Snyder Jr. Proceedings of the 7th Commonwealth and International Conference on Sport, Physical Education, Recreation, and Dance Vol 7<., Publisher unknown, Place unknown, (1982)
H. Law, C. Snyder, and Jr.. Proceedings of a seminar on measuring social behaviour in road research., Australian Road Research Board, Vermont South, Vic, Australia, (1981)