U.S. first lady Grace Anna Coolidge worked actively for many charitable causes, most notably helping the hearing impaired.
Grace Anna Coolidge. (2013). The Biography Channel website. Retrieved 03:56, May 25, 2013, from http://www.biography.com/people/grace-anna-coolidge-9256408.
Grace Anna Coolidge. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/grace-anna-coolidge-9256408 [Accessed 25 May 2013].
"Grace Anna Coolidge." 2013. The Biography Channel website. May 25 2013, 03:56 http://www.biography.com/people/grace-anna-coolidge-9256408.
"Grace Anna Coolidge," The Biography Channel website, 2013, http://www.biography.com/people/grace-anna-coolidge-9256408 [accessed May 25, 2013].
"Grace Anna Coolidge," The Biography Channel website, http://www.biography.com/people/grace-anna-coolidge-9256408 (accessed May 25, 2013).
Grace Anna Coolidge [Internet]. The Biography Channel website; 2013 [cited 2013 May 25] Available from: http://www.biography.com/people/grace-anna-coolidge-9256408.
Grace Anna Coolidge, http://www.biography.com/people/grace-anna-coolidge-9256408 (last visited May 25, 2013).
Grace Anna Coolidge. The Biography Channel website. 2013. Available at: http://www.biography.com/people/grace-anna-coolidge-9256408. Accessed May 25, 2013.