Wood, Paul (2000). Germany's Secret Weapons in World War II. Roger Ford. Zenith Imprint. tr. 41–42. ISBN0-7603-0847-0.
Reitsch, Hanna (1991). The Sky My Kingdom: Memoirs of the Famous German World War II Test-pilot. Lawrence Wilson (trans.). Presidio Press. tr. 194. ISBN1-85367-093-6.