Updated README with arxiv citation and fixed url typo.

README.md

@@ -56,4 +56,15 @@ The image files are all hosted in the AWS S3 bucket `pd12m`. The URLs to the ima
 The dataset is licensed under the [CDLA-Permissive-2.0](https://cdla.dev/permissive-2-0/).
 
 # Reporting Issues
-We've gone through great lengths to ensure the dataset is free from objectionable and infringing content. If you find any issues or have any concerns, please flag the item in [Source.Plus](httpss://source.plus/collection/pd12m-mxenifxs), where our review process will remove the infringing material, and find a suitable replacement.
+We've gone through great lengths to ensure the dataset is free from objectionable and infringing content. If you find any issues or have any concerns, please flag the item in [Source.Plus](https://source.plus/collection/pd12m-mxenifxs), where our review process will remove the infringing material, and find a suitable replacement.
+
+# Citation
+@misc{meyer2024publicdomain12mhighly,
+      title={Public Domain 12M: A Highly Aesthetic Image-Text Dataset with Novel Governance Mechanisms}, 
+      author={Jordan Meyer and Nick Padgett and Cullen Miller and Laura Exline},
+      year={2024},
+      eprint={2410.23144},
+      archivePrefix={arXiv},
+      primaryClass={cs.AI},
+      url={https://arxiv.org/abs/2410.23144}, 
+}