International Society for Educational Information
ISEI, 1987
Buku Teks
Ministry of Education , Government of Japan, 1971
Buku Teks
edited by Noel Entwistle
Routledge, 1990
Buku Referensi
Coombs, Philip H., author
International Institute for Educational Planning Unesco, 1970
Buku Teks
Blackwell Publishing, 2007
Buku Teks