2GAO History-The Modern GAO:The Move to Program Evaluation and Providing Increased Services to Congress[EB/OL], http://www. gao. gov/about/history/ gaohistory_1961-1981. html.
3Roger L. Sperry, Timothy D. Desmond, Kathi F. McGraw, Barbara Schmitt. An Administrative History[M]. Washington, D. C. : U. S. General Accounting Office, 1981.
4GAO:Supporting Congress and Making GAO a Model Organization for the Government,1998 to present[EB/ OL]. http://www. gao. gov/about/history/gaohistory_present. html.