1. Cooperative Extension Service, CES Paper No. 47;B.J. Blake,1979
2. Cooperative Extension Service, CES Paper No. 48;B.F. Blake,1979
3. Blake, B.F., L.F. Schrader and W.L. James. 1978. “New Tools for Marketing Research: The Action Grid.”Feedstuffs, 50 (19) 38–39.
4. Blalock, H.M. 1972.Social Statistics. New York: McGraw-Hill.
5. Citiparks, Pittsburgh Department of Recreation and Parks. 1982. “The Great Race: Importance-Performance Analysis of a Ten-Kilometer Race,” Unpublished manuscript.