APA (7 ম সংস্করণ) উদ্ধৃতি

Copeland, B. (1986). Tariffs and quotas: Retaliation and negotiation with two instruments of protection. Department of Economics, University of British Columbia.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Copeland, Brian. Tariffs and Quotas: Retaliation and Negotiation with Two Instruments of Protection. Vancouver, Canada: Department of Economics, University of British Columbia, 1986.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

Copeland, Brian. Tariffs and Quotas: Retaliation and Negotiation with Two Instruments of Protection. Department of Economics, University of British Columbia, 1986.