diff --git a/pages/topics/question/README.md b/pages/topics/question/README.md
index 592083fc..49b644c9 100644
--- a/pages/topics/question/README.md
+++ b/pages/topics/question/README.md
@@ -156,6 +156,8 @@ Week 1: Intro
 - Get acquainted with the project and Squad Database
 - Download the database and study the bibliography
 - Study [Prodigy annnotation](https://Prodi.gy) tool
+- Read [SQuAD: 100,000+ Questions for Machine Comprehension of Text](https://arxiv.org/abs/1606.05250)
+- Read [Know What You Don't Know: Unanswerable Questions for SQuAD](https://arxiv.org/abs/1806.03822)
 
 Week 2 and 3: Web Application