Update README.md

README.md

@@ -125,5 +125,12 @@ We would like to express our gratitude to the great work done in [CodeGen: An Op
 
 ## Cite codegen-16b-mono-toolbench
 ```
-TBD
+@misc{xu2023tool,
+      title={On the Tool Manipulation Capability of Open-source Large Language Models}, 
+      author={Qiantong Xu and Fenglu Hong and Bo Li and Changran Hu and Zhengyu Chen and Jian Zhang},
+      year={2023},
+      eprint={2305.16504},
+      archivePrefix={arXiv},
+      primaryClass={cs.CL}
+}
 ```