diff --git a/docs/11&12.md b/docs/11&12.md
index 96b2906b7edbd6dfbc3d10695ea9ab8277862337..8cf2f4e36fd6843f6c6117a647530a4b33181076 100644
--- a/docs/11&12.md
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@@ -245,4 +245,10 @@ $\bullet$ 概率匹配：选择有最大概率是最优的动作，如 汤普森
 
 $\bullet$ 信息状态空间：建立并解决扩展 MDP，因此直接包含了信息的价值
 
-## 参考文献
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+## 参考文献
+
+1. <span id="ref1">T. L. Lai, and H. Robbins, "Asymtotically efficient adaptive allocation rules," *Advances in Applied Mathematics*, 1985.</span>
+
+2. <span id="ref2">P. Auer, C. B. Nicolo, and P. Fischer, "Finite-time analysis of the multiarmed bandit problem," *Maching Learning*, 2002.</span>
+
+3. <span id="ref3">R. I. Brafman, and M. Tennenholtz, "R-max - a general polynomial time algorithm for near-optimal reinforcement learning," *Journal of Maching Learning Research*, 2002.</span>
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