United States. Office of Educational Research and Improvement & National Center for Education Statistics. (1990). Key statistics on public elementary and secondary education reported by state and by regional, locale, and wealth clusters. U.S. Dept. of Education, Office of Educational Research and Improvement.
Citación estilo ChicagoUnited States. Office of Educational Research and Improvement and National Center for Education Statistics. Key Statistics on Public Elementary and Secondary Education Reported by State and by Regional, Locale, and Wealth Clusters. Washington, D.C.: U.S. Dept. of Education, Office of Educational Research and Improvement, 1990.
Cita MLAUnited States. Office of Educational Research and Improvement and National Center for Education Statistics. Key Statistics on Public Elementary and Secondary Education Reported by State and by Regional, Locale, and Wealth Clusters. U.S. Dept. of Education, Office of Educational Research and Improvement, 1990.