3Greco, Albert N.. The Book Publishing Industry, 2nd edition, Mahwah: Lawrence Erlbaum Associates, Inc., 2005.
4Petersen, H.Craig. University Libraries and Pricing Practices by Publishers of Scholarly Journals, Research in Higher Education, 31 (4): pp.307--314, 1990.
5Wilder, Stanley J.. Comparing Value and Estimated Revenue of SciTech Journals, ARL Report, 1998.
6Bergstrom, Theodore C.. Free Labor for Costly Journal,Journal of Economic Perspectives, 15 ( 3) : pp.183-198, 2001.
7Bergstrom, Carl T. and Theodore C.. The Economics of Ecology Journals, Frontier in Ecological Environment, 4 (9) : pp.488--496, 2006.
8Financial Accounting Standards Board. Financial State-ments of Not-for-profit Organizations, Statement of Financial A ccounting Standards No.117 , 1993.
9Blazek, Jody. Nonprofit Financial Planning Made Easy, Hoboken: John Wiley & Sons, Inc., 2008.
10Salamon, Lester M.. Defining the Nonprofit Sector:The United States, Working Papers of the Johns Hopkins Comparative Nonprofit Sector Project No. 18, Baltimore: The Johns Hopkins Institute for Policy Studies, 1996.
