Speech by the President of India, Shrimati Pratibha Devisingh Patil, at the Birth Centenary Celebrations of Mother Teresa, pib.nic.in. August 30, 2010.
Mark Twain (2014). “Mark Twain on Common Sense: Timeless Advice and Words of Wisdom from America's Most-Revered Humorist”, p.36, Skyhorse Publishing, Inc.