(1999). Higher education through open and distance learning. Routledge.
Chicago-viite (17. p.)Higher Education Through Open and Distance Learning. Routledge, 1999.
MLA-viite (9. p.)Higher Education Through Open and Distance Learning. Routledge, 1999.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.