4Shera, J. H.. Causal Factor in Public Library Develop ment [M]//Harris, M. H.. Reader in American Li brary History. Washington, D.C.: Microcard Edi tions, 1971 : 141-162.
6United Nations Educational, Scientific and Cultural Organization. The Public Library: A Living Force for Popular Education [EB/OL]. (1949-05-16) [2012- 05-12]. http ://unesdoc.unesco.org/images/0014/001 474/147487eb.pdf.
7Petersen E N. Unesco and Public Libraries LI]. Library Trends, 1953, 1 (4): 531-542.
8United Nations Educational, Scientific and Cultural Organization. The Public Library: A Living Force for Popular Education[EB/OL]. (1949-05-16) [2012-05 -12]. http: //unesdoc.unesco.org/images/0014/001474 / 147487eb.pdf.
9KAWASAKI Y. Historical Development of Standards of the American Public Library: From National Standards to Local Planning [J]. Lifelong Education and Libraries, 2011, 11: 1-11.
