2021 [2023-07-17]. (原始内容存档于2023-06-20). How do social media's virtual tipjar features compare?. The Daily Dot. August 5, 2021 [2023-07-17]. (原始内容存档于2023-05-31)
(原始内容存档于2018-04-03) (英语). Square's 'cashtags' turn a custom web link into a tipjar. Engadget. [2018-04-02]. (原始内容存档于2018-04-03) (美国英语). Square’s Cash app
Kuwait. Journal of Arid Environments. 1997, 35 (3): 511–516. Bibcode:1997JArEn..35..511A. doi:10.1006/jare.1996.0179. Schwab, I. R. Cure for a headache