diff --git a/references.bib b/references.bib
index 1ae3503..ec44224 100644
--- a/references.bib
+++ b/references.bib
@@ -184,7 +184,7 @@
 	author = {Roya Ensafi and Philipp Winter and Abdullah Mueen and Jedidiah R. Crandall},
 	title = {Analyzing the {G}reat {F}irewall of {C}hina Over Space and Time},
 	journal = {Privacy Enhancing Technologies},
-	volume = {1},
+	volume = {2015},
 	number = {1},
 	publisher = {De Gruyter Open},
 	year = {2015},
@@ -195,7 +195,7 @@
 	author = {David Fifield and Chang Lan and Rod Hynes and Percy Wegmann and Vern Paxson},
 	title = {Blocking-resistant communication through domain fronting},
 	journal = {Privacy Enhancing Technologies},
-	volume = {1},
+	volume = {2015},
 	number = {2},
 	publisher = {De Gruyter Open},
 	year = {2015},