Update README.md

README.md

@@ -37,4 +37,14 @@ If you're interested in this direction and/or have open dataset/s you want to ad
 When we index your dataset to UniversalCEFR, we will cite you and the paper/project from which the dataset came across the UniversalCEFR platforms. 
 
 ## Contact
-For questions, concerns, clarifications, and issues, please contact [Joseph Marvin Imperial](https://www.josephimperial.com/) (jmri20@bath.ac.uk).
+For questions, concerns, clarifications, and issues, please contact [Joseph Marvin Imperial](https://www.josephimperial.com/) (jmri20@bath.ac.uk).
+
+## Reference
+```
+@article{imperial2025universalcefr,
+  title = {{UniversalCEFR: Enabling Open Multilingual Research on Language Proficiency Assessment}},
+  author = {Joseph Marvin Imperial and Abdullah Barayan and Regina Stodden and Rodrigo Wilkens and Ricardo Muñoz Sánchez and Lingyun Gao and Melissa Torgbi and Dawn Knight and Gail Forey and Reka R. Jablonkai and Ekaterina Kochmar and Robert Reynolds and Eugénio Ribeiro and Horacio Saggion and Elena Volodina and Sowmya Vajjala and Thomas François and Fernando Alva-Manchego and Harish Tayyar Madabushi},
+  journal = {arXiv preprint arXiv:2506.01419},
+  year = {2025},
+  url = {https://arxiv.org/abs/2506.01419}
+```