8,732
edits
Changes
→External Links
* [https://books.google.com/books?id=eD4EAAAAMBAJ&pg=PA30&lpg=PA30&dq=ti+99+addition+and+subtraction+1&source=bl&ots=8inaXK_nqr&sig=8BZrgHwZFF_Q7dqEda8HEVkWfyg&hl=en&sa=X&ved=2ahUKEwihtcuRlurcAhXk7IMKHUwnCDE4ChDoATAJegQIARAB#v=onepage&q=ti%2099%20addition%20and%20subtraction%201&f=false/ InfoWorld Software Review: Addition and Subtraction 1 (Feb. 8, 1982, pg.30)]
* [https://www.retroplace.com/en/games/7542--addition-and-subtraction-1/ Retroplace: Addition and Subtraction 1]
* [http://www.ti99ers.org/timeline/cartbytitle.html#CC TI-99ers On-line User Group: TI-99 Cartridge Listing]
[[Category:1981 Software]]
