McSwigan, Marie. Snow Treasure. New York: E. P. Dutton and Company, Inc, 1942.
Nazis
Barnes, John. Patton’s Spaceship. Timeline Wars, 1/3. New York: HarperPrism, 1997.
Loftis, Joseph. Doodlebug. Bloomington, IN: AuthorHouse, 2011.
Leotta, Joan. Guilia Goes to War. Legacy of Honor, 1/3. Castaic, CA: Desert Breeze Publishing, 2012.