(2007). Secondary School Course Classification System: School Codes for the Exchange of Data. U.S. Department of Education.
Cita Chicago (17th ed.)Secondary School Course Classification System: School Codes for the Exchange of Data. U.S. Department of Education, 2007.
Cita MLA (9th ed.)Secondary School Course Classification System: School Codes for the Exchange of Data. U.S. Department of Education, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.