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* [https://gamefaqs.gamespot.com/ti99/223041-addition-and-subtraction-2 GameFAQs: Addition and Subtraction 2]
* [http://www.pixelatedarcade.com/games/addition-and-subtraction-2/ Pixelated Arcade: Addition and Subtraction 2]
* [http://www.ti99ers.org/timeline/carta.htm TI99ers On-line User Group: Cartridges: A]* [http://www.ti99ers.org/timeline/cartbytitle.html#CC TI-99ers On-line User Group: TI-99 Cartridge Listing]
[[Category:1981 Software]]
