Harvey Ball (English Wikipedia)

Doug Lennox , illustrated by Catriona Wight (2004), Now You Know More: The Book of Answers, Now You Know, vol. 2 (illustrated ed.), Dundurn, p. 50, ISBN 9781550025309

boston25news.com

Li, Ding (April 2, 2014). "What's the science behind a smile?". Voices. www.britishcouncil.org. Archived from the original on December 5, 2016. Retrieved June 26, 2022. A Swedish study found that it is indeed difficult to keep a long face when you look at people who are smiling at you. Smiling is just contagious! Seeing people smile stimulates our mirror neurones to suppress our facial muscle control, and trigger a smile. 'You smile, I smile' is actually a scientific fact!

Watchmen, DC, 1986 series, entry in the Grand Comics Database, includes picture of cover with the smiley

"United States Census, 1930," database with images, FamilySearch. Retrieved May 10, 2018, Ernest G Ball, Worcester, Worcester, Massachusetts, United States; citing enumeration district (ED) ED 109, sheet 20B, line 75, family 287, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 971; FHL microfilm 2,340,706.

Woo, Elaine (April 14, 2001). "Harvey Ball; Created 'Smiley Face' Design". Los Angeles Times. Retrieved July 18, 2020.

"Obituary for Harvey R. Ball". Rice Funeral Home. April 14, 2001. Retrieved July 18, 2020.

Stamp, Jimmy (March 13, 2013). "Who Really Invented the Smiley Face?". Smithsonian Magazine. Retrieved May 17, 2016.

Semon, Craig S. (March 6, 2009), "Smiley face connection", Worcester Telegram, Worcester, Massachusetts: New York Times Company, ISSN 1050-4184, archived from the original on July 27, 2009

"World Smile Day | Blog | The Humble Co". The Humble Co. Retrieved September 29, 2020. In fact, the commonly known smiley face is considered a symbol of goodwill and good cheer on our planet; an international icon.

Dempsey, Jim (July 7, 1996). "WHO DUNNIT? Harvey Did". Worcester Telegram & Gazette. Worcester Telegram & Gazette. Retrieved December 9, 2022.
KAUFFMAN The Hartford Courant, MATTHEW (September 26, 1988). "FRENCH SMILEY BRINGS FROWN TO U.S. CREATOR". The Hartford Courant. SUN-SENTINEL. Retrieved December 9, 2022.
Li, Ding (April 2, 2014). "What's the science behind a smile?". Voices. www.britishcouncil.org. Archived from the original on December 5, 2016. Retrieved June 26, 2022. A Swedish study found that it is indeed difficult to keep a long face when you look at people who are smiling at you. Smiling is just contagious! Seeing people smile stimulates our mirror neurones to suppress our facial muscle control, and trigger a smile. 'You smile, I smile' is actually a scientific fact!
Semon, Craig S. (March 6, 2009), "Smiley face connection", Worcester Telegram, Worcester, Massachusetts: New York Times Company, ISSN 1050-4184, archived from the original on July 27, 2009

Melady, Mark (April 13, 2001). "Harvey Ball Dies". Telegram & Gazette. Worcester, Massachusetts: Available from NewsBank: America's News – Historical and Current. p. A1. ISSN 1050-4184.
Semon, Craig S. (March 6, 2009), "Smiley face connection", Worcester Telegram, Worcester, Massachusetts: New York Times Company, ISSN 1050-4184, archived from the original on July 27, 2009