Analysis of information sources in references of the Wikipedia article "Tone (linguistics)" in English language version.
Clearly, language contact with Chinese had something to do with the development of Vietnamese tones, as the tonal system of Vietnamese corresponds quite directly to the eight-way system of Middle Chinese[dead link ]
Clearly, language contact with Chinese had something to do with the development of Vietnamese tones, as the tonal system of Vietnamese corresponds quite directly to the eight-way system of Middle Chinese[dead link ]