Schuman, H., & Fresser, S. (1981). Questions and answers in attitude surveys: Experiments on question form, wording, and contetext. Academic Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Schuman, Howard, و Stanlley Fresser. Questions and Answers in Attitude Surveys: Experiments on Question Form, Wording, and Contetext. Academic Press, 1981.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Schuman, Howard, و Stanlley Fresser. Questions and Answers in Attitude Surveys: Experiments on Question Form, Wording, and Contetext. Academic Press, 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.