diff --git a/notes/计算机网络.md b/notes/计算机网络.md
index 5618f765..8f71be19 100644
--- a/notes/计算机网络.md
+++ b/notes/计算机网络.md
@@ -888,3 +888,8 @@ P2P 是一个分布式系统，任何时候都有对等方加入或者退出。
 
 - 计算机网络, 谢希仁
 - JamesF.Kurose, KeithW.Ross, 库罗斯, 等. 计算机网络: 自顶向下方法 [M]. 机械工业出版社, 2014.
+- [Tackling emissions targets in Tokyo](http://www.climatechangenews.com/2011/html/university-tokyo.html)
+- [What does my ISP know when I use Tor?](http://www.climatechangenews.com/2011/html/university-tokyo.html)
+- [Technology-Computer Networking[1]-Computer Networks and the Internet](http://www.linyibin.cn/2017/02/12/technology-ComputerNetworking-Internet/)
+- [P2P 网络概述.](http://slidesplayer.com/slide/11616167/)
+- [Circuit Switching (a) Circuit switching. (b) Packet switching.](http://slideplayer.com/slide/5115386/)