(2000). Preprimary Education Enrollment. U.S. Department of Education.
Citazione stile Chigago Style (17a edizione)Preprimary Education Enrollment. U.S. Department of Education, 2000.
Citatione MLA (9a ed.)Preprimary Education Enrollment. U.S. Department of Education, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.