Iowa. University. Institute of Public Affairs. (1955). A guide to Iowa child caring and placing agencies. Institute of Public Affairs, State University of Iowa, State Department of Social Welfare, Iowa Association of Children's Agencies and Institutions, cooperating. s.n.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Iowa. University. Institute of Public Affairs. A Guide to Iowa Child Caring and Placing Agencies. Institute of Public Affairs, State University of Iowa, State Department of Social Welfare, Iowa Association of Children's Agencies and Institutions, Cooperating. Iowa City: s.n, 1955.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Iowa. University. Institute of Public Affairs. A Guide to Iowa Child Caring and Placing Agencies. Institute of Public Affairs, State University of Iowa, State Department of Social Welfare, Iowa Association of Children's Agencies and Institutions, Cooperating. s.n, 1955.