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diff --git a/paper2/bibliography.bib b/paper2/bibliography.bib
index 8f6c57a..47b8c4c 100644
--- a/paper2/bibliography.bib
+++ b/paper2/bibliography.bib
@@ -109,3 +109,24 @@ title = {Towards formally founded ACT-R simulation and analysis},
 volume = {15},
 journal = {Cognitive Processing}
 }
+
+@book{newell1994unified,
+  title={Unified Theories of Cognition},
+  author={Newell, A.},
+  isbn={9780674921016},
+  lccn={90033423},
+  series={The William James lectures delivered at Harvard University},
+  url={https://books.google.de/books?id=1lbY14DmV2cC},
+  year={1994},
+  publisher={Harvard University Press}
+}
+
+@misc{laird2022introductionsoar,
+      title={Introduction to Soar},
+      author={John E. Laird},
+      year={2022},
+      eprint={2205.03854},
+      archivePrefix={arXiv},
+      primaryClass={cs.AI},
+      url={https://arxiv.org/abs/2205.03854},
+}