Add dataset-source citation to README

README.md

@@ -44,3 +44,16 @@ train = task.get_table("train")
 See the RelBench
 [CONTRIBUTING guide](https://github.com/snap-stanford/relbench/blob/main/CONTRIBUTING.md)
 for the manifest layout.
+
+## Citation
+
+These datasets are from the 4DBInfer benchmark. If you use them, please cite:
+
+```bibtex
+@article{dbinfer,
+  title={4DBInfer: A 4D Benchmarking Toolbox for Graph-Centric Predictive Modeling on Relational DBs},
+  author={Wang, Minjie and Gan, Quan and Wipf, David and Cai, Zhenkun and Li, Ning and Tang, Jianheng and Zhang, Yanlin and Zhang, Zizhao and Mao, Zunyao and Song, Yakun and Wang, Yanbo and Li, Jiahang and Zhang, Han and Yang, Guang and Qin, Xiao and Lei, Chuan and Zhang, Muhan and Zhang, Weinan and Faloutsos, Christos and Zhang, Zheng},
+  journal={arXiv preprint arXiv:2404.18209},
+  year={2024}
+}
+```