APA (7th ed.) Citation

Fisher, J. C., & Pry, R. H. (1971). A simple substitution model of technological change. [s.n.].

Chicago Style (17th ed.) Citation

Fisher, James C., and R. H. Pry. A Simple Substitution Model of Technological Change. [S.l.]: [s.n.], 1971.

MLA (9th ed.) Citation

Fisher, James C., and R. H. Pry. A Simple Substitution Model of Technological Change. [s.n.], 1971.