Add BibTeX + APA citation block

README.md

@@ -21,3 +21,22 @@ configs:
   - split: train
     path: data/train-*
 ---
+
+## Citation
+
+If you use this dataset in your research or downstream work, please cite:
+
+```bibtex
+@misc{polyglot_text_2026,
+  author       = {Fernandes, Reuben Chagas},
+  title        = {PolyglotText: Multilingual Text Pre-training Corpus},
+  year         = {2026},
+  publisher    = {Hugging Face},
+  howpublished = {\url{https://huggingface.co/datasets/Reubencf/PolyglotText}}
+}
+```
+
+APA-style:
+
+> Reuben Chagas Fernandes (2026). *PolyglotText: Multilingual Text Pre-training Corpus* [Dataset]. Hugging Face. https://huggingface.co/datasets/Reubencf/PolyglotText
+