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