1. Andrade, T. The Gunpowder Age: China, Military Innovation, and the Rise of the West in World History. (Princeton: Princeton University Press, 2016).
2. Baklitskaya, K. “The remarkable (and censored) Siberian adventure of stray dog cosmonauts Comet and Shutka,” Siberian Times, May 1, 2013.
3. Barber, M. V2: The A4 Rocket from Peenemunde to Redstone. (Manchester, UK: Crecy Publishing, 2017).
4. Bergaust, E. Wernher von Braun. (London: Stackpole Books, 2017).
5. Bizony, P. The Man Who Ran the Moon: James E. Webb, Nasa, and the Secret History of Project Apollo. (New York: Basic Books, 2007).