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Thank you Ruby for cleaning up the title! (Mundus was my first article). Anyway, I think that the article needs...
Pictures - The illustrations in the book are beautiful, there are some that can be found in Wikimedia Commons.
More info - This is the obvious one. Looking directly at the book for info will be the best source.
For the "In popular culture" heading - I don't know how one would back up the AC4 claim with a source ... perhaps by referencing a screenshot of the game? If you've played the game like I have, then you can personally confirm it.