(2000). Distance Education in Higher Education. U.S. Department of Education.
Chicago-čujuhus (17. p.)Distance Education in Higher Education. U.S. Department of Education, 2000.
MLA-čujuhus (9. p.)Distance Education in Higher Education. U.S. Department of Education, 2000.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.