Update README.rst

Author: fabianp

README.rst

@@ -102,7 +102,23 @@ https://github.com/scikit-learn-contrib/lightning
 Citing
 ------
 
-If you use this software, please cite it. Many citing options are available in `its Zenodo entry <https://doi.org/10.5281/zenodo.200504>`_ .
+If you use this software, please cite it. Here is a BibTex snippet that you can use:
+
+
+.. code-block::
+
+  @misc{blondel_mathieu_2016_200504,
+    author       = {Blondel Mathieu and
+                    Pedregosa Fabian},
+    title        = {{Lightning: large-scale linear classification, 
+                   regression and ranking in Python}},
+    year         = 2016,
+    doi          = {10.5281/zenodo.200504},
+    url          = {https://doi.org/10.5281/zenodo.200504}
+  }
+
+
+Other citing formats are available in `its Zenodo entry <https://doi.org/10.5281/zenodo.200504>`_ .
 
 Authors
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