(1997). Distance education in higher education institutions. US Dep. of Education, Office of Educational Research and Improvement.
Chicago-Zitierstil (17. Ausg.)Distance Education in Higher Education Institutions. Washington, D.C: US Dep. of Education, Office of Educational Research and Improvement, 1997.
MLA-Zitierstil (9. Ausg.)Distance Education in Higher Education Institutions. US Dep. of Education, Office of Educational Research and Improvement, 1997.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.