Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

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