Prakke, H., & Hardt, H. (1971). Towards a philosophy of publicistics. Center of the advanced studies of communication, the University of Iowa.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Prakke, Henk, و Hanno Hardt. Towards a Philosophy of Publicistics. Iowa: Center of the advanced studies of communication, the University of Iowa, 1971.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Prakke, Henk, و Hanno Hardt. Towards a Philosophy of Publicistics. Center of the advanced studies of communication, the University of Iowa, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.