Add source info of GitTables

README.md

@@ -1,3 +1,19 @@
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 license: cc-by-nc-nd-3.0
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+
+## More information and source of GitTables:
+- Website: https://gittables.github.io/
+- Paper: https://dl.acm.org/doi/pdf/10.1145/3588710
+- Dataset page: https://zenodo.org/records/6517052
+- Citation format:
+@article{hulsebos2023gittables,
+  title={Gittables: A large-scale corpus of relational tables},
+  author={Hulsebos, Madelon and Demiralp, {\c{C}}agatay and Groth, Paul},
+  journal={Proceedings of the ACM on Management of Data},
+  volume={1},
+  number={1},
+  pages={1--17},
+  year={2023},
+  publisher={ACM New York, NY, USA}
+}