Pellard (2013), hlm. 90. Pellard, Thomas (2013), "Ryukyuan Perspectives on the proto-Japonic Vowel System", dalam Frellesvig, Bjarke; Sells, Peter (ed.), Japanese/Korean Linguistics (dalam bahasa American English), CSLI Publications, hlm. 81–96
Pellard (2013), hlm. 84-85. Pellard, Thomas (2013), "Ryukyuan Perspectives on the proto-Japonic Vowel System", dalam Frellesvig, Bjarke; Sells, Peter (ed.), Japanese/Korean Linguistics (dalam bahasa American English), CSLI Publications, hlm. 81–96
Pellard (2013), hlm. 84. Pellard, Thomas (2013), "Ryukyuan Perspectives on the proto-Japonic Vowel System", dalam Frellesvig, Bjarke; Sells, Peter (ed.), Japanese/Korean Linguistics (dalam bahasa American English), CSLI Publications, hlm. 81–96
Pellard (2013), hlm. 85. Pellard, Thomas (2013), "Ryukyuan Perspectives on the proto-Japonic Vowel System", dalam Frellesvig, Bjarke; Sells, Peter (ed.), Japanese/Korean Linguistics (dalam bahasa American English), CSLI Publications, hlm. 81–96