International Society for Educational Information, Inc., 1973
Buku Teks
Watanuki, Joji
University of Tokyo Press, 1977
Buku Teks SO
Tong, Rosemarie Putnam
Westview press, 1997
Buku Teks SO
Prokhovnik, Raia
Routledge, 2015
Buku Teks SO
Kosaka, Masataka
Kodansha International , 1972
Buku Teks