* Indices of Rime syllabus of the rime dictionary Guangyun
* Radical-stroke count indices
* Categories of Chinese character according to distinct Cantonese pronunciation syllabus. It is first ordered by s, second by s, and third by s alphabetically.
* A research paper on Cantonese phonetics.
* A suggestion scheme of romanisation of Cantonese
* An English research paper on Cantonese phonetics, completed in , , 1938.
Some characters with multiple pronunciation are commented with meaning, short notes, or usage in each category.