Sawyer, M. C. (1989). The challenge of radical political economy: An introduction to the alternatives to neo-classical economics. Harvester Wheatsheaf.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sawyer, Malcolm C. The Challenge of Radical Political Economy: An Introduction to the Alternatives to Neo-classical Economics. New York: Harvester Wheatsheaf, 1989.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Sawyer, Malcolm C. The Challenge of Radical Political Economy: An Introduction to the Alternatives to Neo-classical Economics. Harvester Wheatsheaf, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.