https://books.google.com.kh/books?id=Vc3wik82cQsC&q. Proceedings. the University of Virginia, 1999. 14 May 2009. p. 884. https://books.google.com.kh/books...
Cultural Context. SUNY Press. p. 286. ល.ស.ប.អ. 9780791413319. https://books.google.com/books?id=r-OYL6Khg0UC. Constance Jones, James D. Ryan (2005), Encyclopedia...
Encyclopedia, pp. 1038-1039, p. 1038, at Google Books; "Tōhoku" in p. 970, p. 970, at Google Books Nussbaum, "Yamagata" in p. 1038, p. 1038, at Google Books...
Japan Encyclopedia, p. 780, p. 780, at Google Books; "Tōhoku" in p. 970, p. 970, at Google Books. Nussbaum, "Akita" in p. 20, p. 20, at Google Books....
Encyclopedia, p. 367, at Google Books; "Kantō" in Japan Encyclopedia, p. 479, at Google Books. Nussbaum, "Mito" at Japan Encyclopedia, p. 642, at Google Books....