| 其他書名 | Challenges for the 21st Century : Statement of David M. Walker, Comptroller General of the United States, Before the Committee on Small Business, U.S. Senate |
| 出版 | U.S. General Accounting Office, 2000 |
| URL | http://books.google.com.hk/books?id=BhUAvgAACAAJ&hl=&source=gbs_api |