1. Human Capital: A Theoretical and Empirical Analysis with Special Reference to Education;Becker,1964
2. Education and economic growth: An overview;Bowman,1980
3. The measurement of US real capital input, 1929–1967;Christensen;Rev. Income Wealth,1969
4. Fertility and Education: What do we Really Know?;Cochrane,1980
5. Why Growth Rates Differ: Post-War Experience in Nine Western Countries;Denison,1967