1 files changed, 15 insertions, 0 deletions
diff --git a/doc/pdi.bib b/doc/pdi.bib
index 489f498..5f0575f 100644
--- a/doc/pdi.bib
+++ b/doc/pdi.bib
@@ -75,6 +75,13 @@ $$ }}}
     keywords = "ref",
     url = "https://cleantechnica.com/2015/05/04/solar-thermal-panels-heating-cooling/"
 }
+
+@online{treesco2,
+    author = "NC State University",
+    title = "Tree Facts",
+    keywords = "ref",
+    url = "https://projects.ncsu.edu/project/treesofstrength/treefact.htm"
+}
 %% }}}
 
 %% - STATISTICS {{{------------------------------------------------------------
@@ -93,6 +100,14 @@ $$ }}}
     keywords = "ref",
     url = "http://www.eea.europa.eu/data-and-maps/indicators/energy-efficiency-and-energy-consumption-5/assessment"
 }
+
+@online{torontohydro,
+    author = "Toronto Hydro",
+    title = "Appliance Usage Chart",
+    keywords = "ref",
+    url = "http://www.torontohydro.com/sites/electricsystem/residential/yourbilloverview/Pages/ApplianceChart.aspx"
+}
+
 %% }}}
 
 %% }}}