1. From guilds to infant training industries;Bowman,1965
2. Many Children Left Behind? Textbooks and Test Scores;Glewwe,2007
3. The role of textbooks in a modern system of education;Heyneman,2006
4. Student Learning in Uganda: Textbook Availability and other Determinants;Heyneman;Comparative Educ. Rev.,1980
5. Textbooks and Achievement: What We Know;Heyneman,1978