-Many off these links are to Wikipedia. You can learn a lot from such articles,
+Many of these links are to Wikipedia. You can learn a lot from such articles,
so long as you remember they may sometimes mislead or make mistakes. However, I
hope at this point in your education you'll have learned to be a guarded reader
even of authoritative treatises by eminent authors. So you shouldn't need any
* [[!wikipedia B,C,K,W system]]
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-* [Chris Barker's Iota and Jot]() (broken link)<p>
+* [Chris Barker's Iota and Jot](http://semarch.linguistics.fas.nyu.edu/barker/Iota/)
* [[!wikipedia Church-Rosser theorem]]
* [[!wikipedia Normalization property]]
* [[!wikipedia Turing completeness]]<p>