Berry, B. J. L., & Hankins, T. D. (1963). A bibliographic guide to the economic regions of the United States. Chicago: University of Chicago Press.
Παραπομπή Chicago StyleBerry, Brian J. L., and Thomas D. Hankins. A Bibliographic Guide to the Economic Regions of the United States. Chicago: University of Chicago Press, 1963.
Παραπομπή MLABerry, Brian J. L., and Thomas D. Hankins. A Bibliographic Guide to the Economic Regions of the United States. Chicago: University of Chicago Press, 1963.
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