Williams, R. G. (1975). Public assistance and work effort: The labor supply of low-income female heads of households. Industrial Relations Section, Dept. of Economics, Princeton University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Williams, Robert George. Public Assistance and Work Effort: The Labor Supply of Low-income Female Heads of Households. Princeton, N.J: Industrial Relations Section, Dept. of Economics, Princeton University, 1975.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Williams, Robert George. Public Assistance and Work Effort: The Labor Supply of Low-income Female Heads of Households. Industrial Relations Section, Dept. of Economics, Princeton University, 1975.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.