1. Adam Kranzel (2013) Card Sleeve Sizes for Games,
https://boardgamegeek.com/geeklist/164572/card-sleeve-sizes-games: Board Game Geek.
2. Mayday Games (2014) Sleeves by Game,
https://docs.google.com/spreadsheets/d/1lk0tzEINcImMKs908eD82DK5LMqKAEWzAYt3co-jqhU/edit?usp=sharing: Mayday Games.
3. A special thank you to the users of reddit and board game geek who are continually asking and answering questions related to board game card sleeve sizes.