APA (7 ম সংস্করণ) উদ্ধৃতি

Feld, W. J., & Boyd, G. (1980). Comparative regional systems: West and East Europe, North America, the Middle East, and developing countries. Pergamon Press.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Feld, Werner J., এবং Gavin;Feld Boyd. Comparative Regional Systems: West and East Europe, North America, the Middle East, and Developing Countries. Pergamon Press, 1980.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Feld, Werner J., এবং Gavin;Feld Boyd. Comparative Regional Systems: West and East Europe, North America, the Middle East, and Developing Countries. Pergamon Press, 1980.