Feld, W. J., & Boyd, G. (1980). Comparative regional systems: West and East Europe, North America, the Middle East, and developing countries. Pergamon Press.
Цитирование в стиле Чикаго (17-е изд.)Feld, Werner J., и Gavin;Feld Boyd. Comparative Regional Systems: West and East Europe, North America, the Middle East, and Developing Countries. Pergamon Press, 1980.
Цитирование MLA (9-е изд.)Feld, Werner J., и Gavin;Feld Boyd. Comparative Regional Systems: West and East Europe, North America, the Middle East, and Developing Countries. Pergamon Press, 1980.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.