International Society for Educational Information
ISEI, 1987
Buku Teks
Virtue and Company Limited , 1977
Buku Teks
World Health Organization, 1955
Buku Teks
Henderson, Dan Fenno, author
University of Tokyo Press, 1965
Buku Teks
Miyamori Asataro, translated
Maruzen, 1936
Buku Referensi