Awards. Franklin Institute. [2015-05-08]. (原始内容存档于2015-05-13). Thomas Alva Edison. The Franklin Institute Awards. Franklin Institute. [2016-01-30]. (原始内容存档于2021-02-23)
ISBN 978-030-783-148-4. (原始内容存档于2021-04-17) (英语). Quoted in Edward A. Marshall, “Edison's Plan for Preparedness,” New York Times Magazine, May 30, 1915, p