Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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