University of Chicago. Graduate Library School., Asheim, L. E., & Fenwick, S. I. (1975). Differentiating the media: Proceedings of the thirty-seventh annual conference of the Graduate Library School, August 5-6, 1974. Chicago: University of Chicago Press.

University of Chicago. Graduate Library School., Lester Eugene Asheim, and Sara Innis Fenwick. Differentiating the Media: Proceedings of the Thirty-seventh Annual Conference of the Graduate Library School, August 5-6, 1974. Chicago: University of Chicago Press, 1975.

University of Chicago. Graduate Library School., Lester Eugene Asheim, and Sara Innis Fenwick. Differentiating the Media: Proceedings of the Thirty-seventh Annual Conference of the Graduate Library School, August 5-6, 1974. Chicago: University of Chicago Press, 1975.