diff --git a/Documents/Padulles_Amphlett.ipynb b/Documents/Padulles_Amphlett.ipynb
index ea08ffc8..1c5e449c 100644
--- a/Documents/Padulles_Amphlett.ipynb
+++ b/Documents/Padulles_Amphlett.ipynb
@@ -12024,6 +12024,9 @@
     "3- J. C. Amphlett, R. M. Baumert, R. F. Mann, B. A. Peppley, and P. R. Roberge. 1995. \"Performance Modeling\n",
     "of the Ballard Mark IV Solid Polymer Electrolyte Fuel Cell.\" J. Electrochem. Soc. (The Electrochemical Society,\n",
     "Inc.) 142 (1): 9-15. doi: 10.1149/1.2043959.\n",
+    "</blockquote>\n",
+    "<blockquote>\n",
+    "4-Larminie, J., Dicks, A., & McDonald, M. S. 2003. Fuel cell systems explained (Vol. 2, pp. 207-225). Chichester, UK: J. Wiley. doi: 10.1002/9781118706992.\n",
     "</blockquote>"
    ]
   }