Jasic Detainee #4: Liu Penghua: We Need a Union, Not Just Rights Defense - Labor Notes. labornotes.org. 26 November 2018 [2022-05-20]. (原始内容存档于2022-01-06)
(link) Former Japanese leader urges his country to reverse claim on forced labor. Korea Herald. Yonhap News Agency. 29 August 2019 [3 December 2019]. (原始内容存档于2023-10-15)