Public Elementary & Secondary School Enrollment: Fall 1970-97. US Department of Education.
Cita Chicago (17th ed.)Public Elementary & Secondary School Enrollment: Fall 1970-97. US Department of Education.
Cita MLA (9th ed.)Public Elementary & Secondary School Enrollment: Fall 1970-97. US Department of Education.
Atenció: Aquestes cites poden no estar 100% correctes.