| 其他書名 | On the Occasion of an Exhibition at the National Portrait Gallery, October 16, 1980, to January 4, 1981 and at the Pennsylvania Academy of Fine Arts, January 30 to April 19, 1981 |
| 出版 | Smithsonian institution Press, 1980 |
| URL | http://books.google.com.hk/books?id=np4LwwEACAAJ&hl=&source=gbs_api |