National Center for Education Statistics. (1999). Education statistics quarterly. National Center for Education Statistics, Office of Educational Research and Improvement, U.S. Dept. of Education.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)National Center for Education Statistics. Education Statistics Quarterly. Washington, DC: National Center for Education Statistics, Office of Educational Research and Improvement, U.S. Dept. of Education, 1999.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)National Center for Education Statistics. Education Statistics Quarterly. National Center for Education Statistics, Office of Educational Research and Improvement, U.S. Dept. of Education, 1999.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.