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8Carlson Darren K. "Poll Shows Continuing Strong American Reading Habits", Non--fiction more Popular than Fiction: Book Discussion Groups not a Large Factor Yet. Princeton: Gallup News Service, 1999 (9).
9Martha L. Burns, Nancy Dowd, Terry Edwards, et al. A manual to help your library celebrate 'National Reading Group Month'. National Reading Group Month Celebration 2008 Manual, 2008 (4) : 1. http: //www. nationalreadinggroupmonth, org/PDFS/NJLA- NRGM_Manual. pdf, 2010-04-01.
10ALA/PPO. Cultural Programs for Adults in Public Libraries: A survey Report. ALA/PPO, 1999.