Feld, W. J., & Boyd, G. (1980). Comparative regional systems : West and East Europe, North America, the Middle East and developing countries: West and East Europe, North America, the Middle East and developing countries. Pergamon Press.
Chicago Style (17th ed.) CitationFeld, Werner J., and Gavin Boyd. Comparative Regional Systems : West and East Europe, North America, the Middle East and Developing Countries: West and East Europe, North America, the Middle East and Developing Countries. New York: Pergamon Press, 1980.
MLA (9th ed.) CitationFeld, Werner J., and Gavin Boyd. Comparative Regional Systems : West and East Europe, North America, the Middle East and Developing Countries: West and East Europe, North America, the Middle East and Developing Countries. Pergamon Press, 1980.