| 其他書名 | Three Lectures on Philosophy and Applied Economics |
| 出版 | U.S. Department of Agriculture, Economic Research Service, Natural Resource Economics Division, 1987 |
| URL | http://books.google.com.hk/books?id=sFwrbCy1l1wC&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |