| 其他書名 | Chemical Calibration : Providers of Proficiency Testing |
| 出版 | U.S. Department of Commerce, Technology Administration, National Institute of Standards and Technology, 1999 |
| URL | http://books.google.com.hk/books?id=l-ZGTwAm-1MC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |