Japanese 論文 Hideo Okada ·1991-12-01 ·『Journal of the International Phonetic Association』 21(2) pp. 94-96 doi:10.1017/s002510030000445x
Speech Characteristics of Patients with Parkinson’s Disease: I. Intensity, Pitch, and Duration 論文 Gerald J. Canter ·1963-08-01 ·『Journal of Speech and Hearing Disorders』 28(3) pp. 221-229 doi:10.1044/jshd.2803.221
Visible Speech 図書 John DeFrancis ·1989-12-31 ·『University of Hawaii Press eBooks』 doi:10.1515/9780824841621