Thesis (Ph. D.)--University of Pennsylvania, 1920. / "Reprinted from the Journal of educational psychology." Also available in digital form on the Internet Archive Web site.
| Identifer | oai:union.ndltd.org:OCLC/oai:xtcat.oclc.org:OCLCNo/5997190 |
| Date | January 1921 |
| Creators | Waples, Douglas, |
| Publisher | Balt[im]o[re] Md., |
| Source Sets | OCLC |
| Language | English |
| Detected Language | English |
Page generated in 0.0023 seconds