Cheng, C. Y. (2015). 台灣閩南語元音及其相關協同構音現象之研究 [master's thesis, National Tsing Hua University]. Airiti Library. https://www.airitilibrary.com/Article/Detail?DocID=U0016-0312201510295453
Pheng, T. G. (2022). 日治時期台灣歌仔冊ê本土化研究 [doctoral dissertation, National Taiwan Normal University]. Airiti Library. https://doi.org/10.6345/NTNU202201594