Books
A catalogue of various books relating to the Metal Gear series, with links to (public and/or legal) ways to access them where possible. I'm sure you can find the ones without links on your own.
As a note, a lot of these links go to Japanese Amazon - it's actually very easy to set up a Japanese Amazon account and buy ebooks on there. I highly recommend it if you're interested in getting your (digital) hands on some of the novels in particular.
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Novelisations
▹ English and Japanese novelisations of each game
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Comics
▹ Comic/graphic novel adaptations of the games
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Art Books
▹ Art books for individual games and the series in general
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Guidebooks
▹ Official strategy guides
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Manuals
▹ Manuals included with each game