Coombs, Philip H., author
International Institute for Educational Planning Unesco, 1970
Buku Teks
Yusuf Enoch, author
Bumi Aksara, 1992
Buku Teks
Wina Sanjaya, author
Kencana Prenada Media Group, 2010
Buku Teks
Coverdale, G.M.
Unesco, International Institute for Educational Planning , 1974
Buku Teks
Sri Endang Mulyati, author
Fakultas Eknonomi dan Bisnis Universitas Indonesia, 2010
UI - Tesis (Open)