diff --git a/README.rst b/README.rst
index 2a358f95..8249b22f 100644
--- a/README.rst
+++ b/README.rst
@@ -49,8 +49,7 @@ with extended particle information and extra goodies.
 The PDG defines the standard particle identification (ID) numbering scheme.
 The package provides the ``PDGID`` class implementing queries on those PDG IDs.
 The queries are also accessible through free standing functions mimicking,
-and expanding from, the HepPID/HepPDT C++ interface
-(see http://lcgapp.cern.ch/project/simu/HepPDT/).
+and expanding from, the HepPID/HepPDT C++ interface.
 
 The ``Particle`` class wraps the information in the PDG particle data tables and
 provides an object-oriented interface and powerful search and look-up utilities.
diff --git a/src/particle/pdgid/__init__.py b/src/particle/pdgid/__init__.py
index 2218563b..ca8b0a43 100644
--- a/src/particle/pdgid/__init__.py
+++ b/src/particle/pdgid/__init__.py
@@ -57,10 +57,6 @@
  4    1   5   L=J+1 , S=1              4^++     \-                                        30qq9
 ==== === === ======================== ======== ================= ====================== =======================
 
-References
-----------
-
-HepPDT and HepPID versions 3.04.01: http://lcgapp.cern.ch/project/simu/HepPDT/
 """
 
 from __future__ import absolute_import
diff --git a/src/particle/pdgid/functions.py b/src/particle/pdgid/functions.py
index ced6b0f6..e68ba805 100644
--- a/src/particle/pdgid/functions.py
+++ b/src/particle/pdgid/functions.py
@@ -21,7 +21,7 @@
 ----------
 
 - PDG document "Monte Carlo Particle Numbering Scheme".
-- HepPDT and HepPID versions 3.04.01: http://lcgapp.cern.ch/project/simu/HepPDT/
+- HepPDT and HepPID versions 3.04.01.
 """
 
 from __future__ import print_function, division, absolute_import