Thorpe (1983), p. 60–61. Thorpe, Maner Lawton (1983). Ryūkyūan Language History (doctoral dissertation) (Thesis). Los Angeles: University of Southern California. doi:10.25549/usctheses-c3-505374.
Thorpe (1983), p. 31. Thorpe, Maner Lawton (1983). Ryūkyūan Language History (doctoral dissertation) (Thesis). Los Angeles: University of Southern California. doi:10.25549/usctheses-c3-505374.
Thorpe (1983), pp. 51–53. Thorpe, Maner Lawton (1983). Ryūkyūan Language History (doctoral dissertation) (Thesis). Los Angeles: University of Southern California. doi:10.25549/usctheses-c3-505374.