Berry, B. J. L., Conkling, E. C., & Ray, D. M. (1976). The geography of economic systems. Prentice-Hall.
Chicago Style (17th ed.) CitationBerry, Brian J. L., Edgar C. Conkling, and David Michael Ray. The Geography of Economic Systems. Englewood Cliffs, N.J.: Prentice-Hall, 1976.
MLA (9th ed.) CitationBerry, Brian J. L., et al. The Geography of Economic Systems. Prentice-Hall, 1976.