Update bib.bib

DeclareDesign · Jan 24, 2019 · 6bb72e3 · 6bb72e3
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diff --git a/vignettes/bib.bib b/vignettes/bib.bib
@@ -13,6 +13,16 @@ @techreport{imbens2014instrumental
   institution={National Bureau of Economic Research}
 }
 
+@article{collier2011understanding,
+	Author = {Collier, David},
+	Journal = {PS: Political Science \& Politics},
+	Number = {4},
+	Pages = {823--830},
+	Publisher = {Cambridge: Cambridge University Press},
+	Title = {Understanding process tracing},
+	Volume = {44},
+	Year = {2011}}
+
 @book{murray1998design,
   title={Design and analysis of group-randomized trials},
   author={Murray, David M},