5Lowry CB. Three years and counting - the economic crisis is still with us. portal: Libraries and the Academy, 2011 (3) : 757 -764.
6The 2012 state of America~ Libraries: a report from the A- merican Library Association. American Libraries. Special issue. [2013 -01 - 15 ]. http://www, ala. org/news! sites/ala, org. news/files/contentfStateofAmericasLibraries-Report~012Finalwithcover3. pdf.
7Zauha MJ. Recreational Reading in Academic Browsing Rooms: Resources for Readers'Advisory. Collection Build- ing, 1993(12) : 57.
8El|iott J. Academic Libraries and Extracurricular Reading Promotion. Reference & User Services Quarterly, 2007 (Spring) : 34 -43.
2Gilbert S G, Weiss B. A rationale for lowering the blood lead action level from 10 to 2 mu g/dL[J]. Neurotoxicology, 2006, 27(5Sp. Iss. SI): 693-701.
3Lanphear B P, Hornung R, Khoury J, et al. Low-level environmental lead exposure and children's intellectual function: an international pooled analysis[J]. Environmental Health Perspectives, 2005, 113(7): 894-899.
4Ayres R U. Industrial Metabolism: Theory and Pohcy[M]. Allenby B R, Richards D J. The Greening of Industrial Ecosystems. Washington D.C.: National Academy Press 1994: 23-37.
5Mao J S, Dong J, Graedel T E. The multilevel cycle of anthropogenic lead I. Methodology[J]. Resources, Conservation and Recycling, 2008, 52(8-9): 1058-1064.
6Mao J S, Dong J, Graedel T E. The multilevel cycle of anthropogenic lead II. Results and discussion[J]. Resources, Conservation and Recycling, 2008, 52(8-9): 1050-1057.
7Luo Wen-hong, Zhang Yuan, Li Hui. Children's blood lead levels after the phasing out of leaded gasoline in Shantou, China[J].Archives of Environmental Health, 2003, 58(3): 184-187.
8WHO. Lead: Assessing the Environmental Burden of Disease at National and Local Levels [EB/OL]. (2003)[2008-7-16]. http://www.who.int/quantifying_ehimpacts/publications/en/ leadebd 2. pdf.
9Pirkle J L, Kaufmann R B, Brody D J, et al. Exposure of the U.S. Population to Lead, 1991-1994 [J]. Environmental Health Perspectives, 1998, 106(11): 745-750.
10EPA. Economic analysis of toxic substances control act Ssection403 [EB/OL]. (2000-12 -21) [2008 -8-16].http:// www. epa.gov/lead/pubs/403_ea_d21.pdf.