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http://www.cullenhartley.com/wp-content/uploads/2009/05/american-vs-british-spellings-wwwcullenhartleycom.pdf

http://ci.nii.ac.jp/naid/110000487356

http://ci.nii.ac.jp/naid/110000248720

http://ci.nii.ac.jp/naid/110004818749

http://ci.nii.ac.jp/naid/110009831480

http://www.japantimes.co.jp/news/2015/04/30/national/politics-diplomacy/full-text-abes-speech-u-s-congress/#.VUSRMu-Jipp

https://www.youtube.com/watch?t=80&v=udanHWNbcP0

Bada, E. (2001). Native language influence on the production of English sounds by Japanese learners. The Reading Matrix, 1(2). Retrieved from http://www.readingmatrix.com/articles/bada/article.pdf

Ohata, K. (2004). Phonological differences between Japanese and English: Several potentially
problematic areas of pronunciation for Japanese ESL/EFL learners. Asian EFL Journal,
6(4). Retrieved from http://www.asian-efl-journal.com/december_04_KO.php