Update README.md

README.md

@@ -55,6 +55,7 @@ An example data instance from the dataset:
 
 ### Citation Information
 
+```bibtex
 @inproceedings{freitas2009relation,
   title={Relation detection between named entities: report of a shared task},
   author={Freitas, Cl{\\'a}udia and Santos, Diana and Mota, Cristina and Oliveira, Hugo Gon{\\c{c}}alo and Carvalho, Paula},
@@ -62,3 +63,4 @@ An example data instance from the dataset:
   pages={129--137},
   year={2009}
 }
+```