University of Chicago. Graduate Library School. Conference & Asheim, L. E. (1955). The future of the book: Implications of the newer developments in communication : papers presented before the Twentieth Annual Conference of the Graduate Library School of the University of Chicago, June 20-24, 1955. University of Chicago, Graduate Library School.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)University of Chicago. Graduate Library School. Conference و Lester Eugene Asheim. The Future of the Book: Implications of the Newer Developments in Communication : Papers Presented Before the Twentieth Annual Conference of the Graduate Library School of the University of Chicago, June 20-24, 1955. Chicago: University of Chicago, Graduate Library School, 1955.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)University of Chicago. Graduate Library School. Conference و Lester Eugene Asheim. The Future of the Book: Implications of the Newer Developments in Communication : Papers Presented Before the Twentieth Annual Conference of the Graduate Library School of the University of Chicago, June 20-24, 1955. University of Chicago, Graduate Library School, 1955.