(原始内容存档于2008-12-04). Palaeolithic Throwing Object (页面存档备份,存于互联网档案馆) – Throwing experiments with the Palaeolithic throwing object from the Oblazowa in the
RTHK. 2020-07-03 [2021-01-16]. (原始内容存档于2021-01-22). Alabama students throwing 'COVID parties' to see who gets infected: Officials. AbcNews. [2020-07-02]