Green, William (19 de julho de 2008). «Big Game Hunter». Time. Consultado em 7 de março de 2015
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Quote from Irvin himself in video "Deciphering the world's oldest rule book" which goes as follows, from minute 03:55 onwards: "And I have to say, I feel guilty now when I think about it because I made my poor sister Angela play this game endlessly with me to see how the rules worked, on the basis [...]."Deciphering the world's oldest rule book | Irving Finkel | Curator's Corner pilot
