1. Experimental design in social action program evaluation: An introduction;Smith,1977
2. Early intervention with organically damaged and high-risk infants;Brassell,1974
3. An evaluation of the Portage Project;Peniston,1972
4. The Portage Project: A model for early childhood education;Shearer;Exceptional Children,1972
5. Early intervention and language development in hearing impaired children;Liff,1973