Jelaskan Daftar pustaka dari George P. Putnam

Goldstein, Donald M. and Dillon, Katherine V. Amelia: The Centennial Biography of an Aviation Pioneer. Washington, DC: Brassey's, 1997. ISBN 1-57488-134-5.

Lovell, Mary S. The Sound of Wings. New York: St. Martin's Press, 1989. ISBN 0-312-03431-8.