| 其他書名 | Degree of Vision, Mode of Reading : an Analysis of Children Registered with the American Printing House for the Blind in January of 1960 Under the Act "To Promote the Education of the Blind" |
| 出版 | U.S. Department of Health, Education, and Welfare, Office of Education, 1961 |
| URL | http://books.google.com.hk/books?id=nDLBGkhpGswC&hl=&source=gbs_api |