Gaya APA
Keegan, Desmond.. (1996).
Theoritical principles of distance education : editor: Desmond Keegan (Cet. 2).
London:
Routledge.
Gaya Chicago
Keegan, Desmond..
Theoritical principles of distance education : editor: Desmond Keegan.
Cet. 2
London:
Routledge,
1996.
Buku.
Gaya MLA
Keegan, Desmond..
Theoritical principles of distance education : editor: Desmond Keegan.
Cet. 2
London:
Routledge,
1996.
Buku.
Gaya Turabian
Keegan, Desmond..
Theoritical principles of distance education : editor: Desmond Keegan.
Cet. 2
London:
Routledge,
1996.
Buku.