Maekawa (2023). Maekawa, Kikuo (2023), "Production of the utterance-final moraic nasal in Japanese: A real-time MRI study", Journal of the International Phonetic Association, 53 (1): 189–212, doi:10.1017/S0025100321000050
google.com.tw
Ōshima, Masatake (5 February 1899). "古今入聲の比較". 東京獨立雜誌 (in Japanese) (21): 13.