8National Center for Education Statistics. Digest of education statistics 2004[R]. U.S. department of education, 2004.
9Higher Education in Japan. Higher Education Bureau, Ministry of Education, Culture, Sports, Science and Technology (MEXT) [EB/OL]. [2014-10-24]. hnp://www.mext.go.jp/english/highered/ 1302653.htm.
10佚名. 26 U.S. Code 501- Exemption from tax on corporations, certain trusts, etc [EB/OL]. [2013-01-30]. http:// https'.//wwwJaw.cornell. edu/uscode/text/26/501.