[http://blog.sigfpe.com/2006/11/yoneda-lemma.html] Reverse Engineering Machines with the Yoneda Lemma
[http://opencs.wikidot.com] DIY Computer Science Master Degree by Parag Shah
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[[File:BYNCND.png | link=http://creativecommons.org/licenses/by-nc-nd/3.0/cn/ ]] [http://creativecommons.org/licenses/by-nc-nd/3.0/cn/ 署名-非商业性使用-禁止演绎 3.0 中国大陆 (CC BY-NC-ND 3.0 CN)]