• Mach 2 Nerf Gun YouTube Video by Giaco Whatever

https://www.youtube.com/watch?v=BrtBc-9pQv4

• Research in Supersonic Flight and the Breaking of the Sound Barrier eBook by John D. Anderson, Jr.

https://history.nasa.gov/SP-4219/Chapter3.html

• Physics For Scientists and Engineers Textbook by Randall D. Knight

Chapter 4, 17, and 27

• btrettel’s Nerf Blog

http://btrettel.nerfers.com/

• Physicsly Possible: Nerf Blasters and Drag Coefficients

http://physicslypossible.blogspot.com/2015/04/nerf-blasters-and-drag-coefficients-ive.html

• Solenoid by HyperPhysics from Georgia State University Physics Department

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/solenoid.html

• Quora Answer by Retired Physics Teacher Gary Novosielski

https://www.quora.com/What-is-the-physics-behind-longer-gun-barrels-resulting-in-higher-muzzle-velocity-why-are-super-guns-so-long

• Long Range Shooting: External Ballistics – Bullet Shape by Loadout Room

https://loadoutroom.com/thearmsguide/long-range-shooting-external-ballistics-bullet-shape/

• Solenoid Wiki Page

https://en.wikipedia.org/wiki/Solenoid

• Sonic Boom Wiki Page

https://en.wikipedia.org/wiki/Sonic_boom

• Overpressure Wiki Page

https://en.wikipedia.org/wiki/Overpressure