| 其他書名 | The Conditions and Social Consequences of Lettuce Harvest Mechanization : a Social Impact Analysis |
| 出版 | Department of Applied Behavioral Sciences, California Agricultural Policy Seminar, College of Agriculture and Environmental Studies, University of California, 1978 |
| URL | http://books.google.com.hk/books?id=R0kfAQAAIAAJ&hl=&source=gbs_api |