1. Calvin Coolidge – Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Calvin_Coolidge
2. Calvin Coolidge | The White House
www.whitehouse.gov/about/presidents/calvincoolidge
3. American President: Calvin Coolidge
millercenter.org/president/coolidge
4. Calvin Coolidge Memorial Foundation | Plymouth, Vermont
www.calvin–coolidge.org/
5.
Calvin Coolidge — History.com Articles, Video, Pictures and Facts
www.history.com/topics/calvin–coolidge
6.
www.brainyquote.com/quotes/authors/c/calvin_coolidge.html
7.
www.forbeslibrary.org/coolidge/coolidge.shtml
8.
www.britannica.com/EBchecked/topic/136173/Calvin–Coolidge
9.
www.pbs.org/wgbh/americanexperience/…/presidents-coolidge/
10.
www.ipl.org/div/potus/ccoolidge.html