APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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

Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.