Leven, C. L., Legler, J. B., & Shapiro, P. (1970). An analytical framework for regional development policy. MIT Press.

Leven, Charles L., John B. Legler, and Perry Shapiro. An Analytical Framework for Regional Development Policy. Cambridge, Mass.: MIT Press, 1970.

Leven, Charles L., et al. An Analytical Framework for Regional Development Policy. MIT Press, 1970.