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.
Chicago Style aipamenaUnited 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.
MLA aipamenaUnited 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.