Παραπομπή APA
Berry, B. J. L., Conkling, E. C., & Ray, D. M. (1976). The georgraphy of economic systems. Englewood Cliffs, N.J.: Prentice-Hall.
Παραπομπή Chicago StyleBerry, Brian Joe Lobley, Edgar C. Conkling, and David Michael Ray. The Georgraphy of Economic Systems. Englewood Cliffs, N.J.: Prentice-Hall, 1976.
Παραπομπή MLABerry, Brian Joe Lobley, Edgar C. Conkling, and David Michael Ray. The Georgraphy of Economic Systems. Englewood Cliffs, N.J.: Prentice-Hall, 1976.
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