diff --git a/docs/index.rst b/docs/index.rst
index 65c2797ea..ca97fce04 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -49,6 +49,13 @@ Source code and Issue Tracker
Available on Github, `CamDavidsonPilon/lifelines `_
Please report bugs, issues and feature extensions there. We also have `Gitter channel `_ open to discuss lifelines:
+Citing lifelines
+------------------------------
+
+The following link will bring you to a page where you can find the latest citation for lifelines:
+
+`Citation for lifelines `_
+
Indices and tables
==================
diff --git a/lifelines/fitters/coxph_fitter.py b/lifelines/fitters/coxph_fitter.py
index 18c020286..599784275 100644
--- a/lifelines/fitters/coxph_fitter.py
+++ b/lifelines/fitters/coxph_fitter.py
@@ -573,7 +573,7 @@ def predict_expectation(self, X):
return pd.DataFrame(trapz(v.values.T, v.index), index=subjects)
def _compute_baseline_hazard(self, data, durations, event_observed, name):
- # http://courses.nus.edu.sg/course/stacar/internet/st3242/handouts/notes3.pdf
+ # https://stats.stackexchange.com/questions/46532/cox-baseline-hazard
ind_hazards = self.predict_partial_hazard(data)
ind_hazards['event_at'] = durations.values
ind_hazards_summed_over_durations = ind_hazards.groupby('event_at')[0].sum().sort_index(ascending=False).cumsum()