（页面存档备份，存于互联网档案馆） English-Cantonese Dictionary, Cantonese in Yale Romanization. 香港: New-Asia-Yale-in-China Chinese Language Center, Chinese University of Hong Kong.

粵語標準羅馬字

Roy T. The Cantonese Speaker’s Dictionary. [Hong Kong]: Hong Kong University Press, 1965. 關彩華等（編）. 《英粵字典：Cantonese in Yale Romanization》. 沙田: 中文大學出版社

清齦腭塞擦音

Xumi, Part 1: Lower Xumi, the Variety of the Lower and Middle Reaches of the Shuiluo River (PDF), Journal of the International Phonetic Association,

Found in articles

馬奕猷

粵語標準羅馬字

Roy T. The Cantonese Speaker’s Dictionary. [Hong Kong]: Hong Kong University Press, 1965. 關彩華等（編）. 《英粵字典：Cantonese in Yale Romanization》. 沙田: 中文大學出版社

清齦腭塞擦音

Xumi, Part 1: Lower Xumi, the Variety of the Lower and Middle Reaches of the Shuiluo River (PDF), Journal of the International Phonetic Association,