http://www.pong-story.com/executivegames.htm
Smith, November 1975 https://books.google.de/books?id=Cxy_DwAAQBAJ&pg=PT205&dq=%22television+tennis%22+executive+games&hl=de&sa=X&ved=2ahUKEwjHz5qc_8TqAhWJyqQKHbN2BTUQ6AEwAnoECAUQAg#v=onepage&q=%22television%20tennis%22%20executive%20games&f=false
November 1975 + Story "The whole history of Executive Games is detailed in a well-written business case study authored by an MIT student, Victor Tom, in 1977. Glen Dash, one of the MIT students who developed Television Tennis, made corrections to this document and sent it to us." http://www.pong-story.com/ExecutiveGames.pdf
https://archive.org/details/MIT-Technology-Review-1976-02/page/n117/mode/2up?q=tennis
https://books.google.de/books?id=auMDAAAAMBAJ&pg=PA80&lpg=PA80&dq=%22Television+Tennis%22+executive+games&source=bl&ots=0Xf0DKOJCo&sig=ACfU3U0RonzI-CT1YcZud5I0bDFdaSe6AQ&hl=de&sa=X&ved=2ahUKEwiL9PKL1MLqAhUCzqQKHcyXD4YQ6AEwCXoECAkQAQ#v=onepage&q=%22Television%20Tennis%22%20executive%20games&f=false
https://archive.org/details/book_atari_book/page/n123/mode/2up?q=television
1975 Bericht "But the least costly home video game on the market— $65 retail— is "Television Tennis" from Executive Games. It is next year, however, that the games will really begin to proliferate." (Electronics, Band 48,Teil 4, McGraw-Hill Publishing Company, 1975 - gefunden via https://www.google.com/search?q=%22television+tennis%22+executive&tbs=bkt:b&tbm=bks&source=lnt&sa=X&ved=0ahUKEwi3xrjDgcXqAhWF-6QKHS31AWI4FBCnBQgg&biw=1469&bih=743&dpr=1.2 )
Januar 1976 Anzeige https://books.google.de/books?id=x0dNAAAAIBAJ&pg=PA2&dq=%22television+tennis%22+executive&article_id=2854,4344770&hl=de&sa=X&ved=2ahUKEwjwo7LvgMXqAhUOqaQKHc4tCK8Q6AEwAHoECAQQAg#v=onepage&q=%22television%20tennis%22%20executive&f=false
Nov 1976 Anzeige https://books.google.de/books?id=boBIAAAAIBAJ&pg=PA4&dq=%22television+tennis%22+executive&article_id=4313,3386253&hl=de&sa=X&ved=2ahUKEwjwo7LvgMXqAhUOqaQKHc4tCK8Q6AEwA3oECAEQAg#v=onepage&q=%22television%20tennis%22%20executive&f=false