| 其他書名 | An Investigation of Sex Differences in the Use Made by Boys and Girls of Four Levels of Conceptual Maturity in Solving Elementary Mathematical Problems |
| 出版 | Fresno State College, 1967 |
| URL | http://books.google.com.hk/books?id=mLnqNwAACAAJ&hl=&source=gbs_api |