| 其他書名 | The Twelfth in a Series of Annual Public Discussions on Problems of Current Interest in the Social Sciences, and of Particular Interest to the Citizens of Minnesota |
| 出版 | Presented and published under the auspices of the Social Science Research Center of the Graduate School, University of Minnesota, 1959 |
| URL | http://books.google.com.hk/books?id=CAgiAAAAMAAJ&hl=&source=gbs_api |