APA (7th ed.) Citation

Ayres, L. P. (1920). An index number for state school systems. Department of education, Russell Sage foundation.

Chicago Style (17th ed.) Citation

Ayres, Leonard Porter. An Index Number for State School Systems. New York city: Department of education, Russell Sage foundation, 1920.

MLA (9th ed.) Citation

Ayres, Leonard Porter. An Index Number for State School Systems. Department of education, Russell Sage foundation, 1920.

Warning: These citations may not always be 100% accurate.