Citation:
Interactive pinyin chart. Yoyo Chinese. https://yoyochinese.com/chinese-learning-tools/Mandarin-Chinese-pronunciation-lesson/pinyin-chart-table
Citation:
Forvo Team. Forvo.com. https://forvo.com/
Citation:
Wade-Giles to pinyin conversion table. The University of Chicago Library. https://www.lib.uchicago.edu/about/directory/departments/eastasia/find/wade-giles-pinyin-conversion-table/