Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.