Cita APA (7th ed.)

(2000). Percentage of Higher Education Institutions Offering Distance Education. U.S. Department of Education.

Cita Chicago (17th ed.)

Percentage of Higher Education Institutions Offering Distance Education. U.S. Department of Education, 2000.

Cita MLA (9th ed.)

Percentage of Higher Education Institutions Offering Distance Education. U.S. Department of Education, 2000.

Atenció: Aquestes cites poden no estar 100% correctes.