Handbook of American Indian languages by Franz Boas and Indian linguistic families of America, north ofMexico, by J. W. Powell, Lincoln: University of Nebraska)
₡,薩爾瓦多科朗與哥斯大黎加科朗的貨幣符號 Saanich orthography and phonology (页面存档备份,存于互联网档案馆) Phonetic symbols for consonants as commonly used for languagesofMexico (页面存档备份,存于互联网档案馆)