「Air Resistance Formula.」 Math, softschools.com/formulas/physics/air_resistance_formula/85/.
「Drag Coefficient.」 Engineering ToolBox, www.engineeringtoolbox.com/drag-coefficient-d_627.html.
Elert, Glenn. 「Density of Air.」 Density of Air - The Physics Factbook, hypertextbook.com/facts/2000/RachelChu.shtml.
矩陣星 . 「美股暴跌,我們研究了如何用加農炮把川普發射到太陽上.」 微信公眾平臺, mp.weixin.qq.com/s/bnemDJ4DX-Z4M0pmy_w-2A.
「三萬到四萬米的高空處,空氣的密度是多少.」 百度知道, 20 July 2017, zhidao.baidu.com/question/1051948809936804019.html.
「鈾-235 中235是什麼意思.」 百度知道, 11 Aug. 2013, zhidao.baidu.com/question/579512799.html.
Hardy, Ryan. 「Could You Launch Someone Into The Sun With A Big Enough ...」 Gizmodo, 5 Dec. 2014, www.gizmodo.com.au/2014/12/could-you-launch-someone-into-the-sun-with-a-big-enough-cannon/.
Tsokos, K.A. (italics) Physics for the IB Diploma, Sixth Edition. Cambridge University Press, 2014.