[2021-02-01]. (原始内容存档于2021-02-01) (英语). Hitech snap up Red Bull junior duo Crawford and Iwasa. FIAFormula3® - The Official F3® Website. 15 January 2021 [2021-01-24]
[14 November 2022]. (原始内容存档于2022-11-14) (英语). Hitech confirm Hadjar and Crawford for all-Red Bull 2023 line-up. FIA_F2® - The Official F2® Website. [2023-01-18]
FIAFormula3® - The Official F3® Website. [2022-01-11]. (原始内容存档于2022-01-11) (英语). Crawford completes PREMA Racing’s roster for 2022. FIAFormula3® - The Official F3®