National Planning Association (U.S.A.), Private Planning Association of Canada, Wonnacott, P., & Wonnacott, R. J. (1967). U.S. - Canadian free trade: The potential impact on the Canadian economy. National Planning Association and Private Planning Association of Canada.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Planning Association (U.S.A.), Private Planning Association of Canada, Paul Wonnacott, و Ronald J. Wonnacott. U.S. - Canadian Free Trade: The Potential Impact on the Canadian Economy. [Washington, D.C.]: National Planning Association and Private Planning Association of Canada, 1967.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Planning Association (U.S.A.), et al. U.S. - Canadian Free Trade: The Potential Impact on the Canadian Economy. National Planning Association and Private Planning Association of Canada, 1967.