diff --git a/references.bib b/references.bib
index 24948a3..f819d8d 100644
--- a/references.bib
+++ b/references.bib
@@ -590,7 +590,7 @@
 	number = {4},
 	publisher = {De Gruyter Open},
 	year = {2016},
-    pages = {83--101},
+	pages = {83--101},
 	url = {https://www.degruyter.com/downloadpdf/j/popets.2016.2016.issue-4/popets-2016-0030/popets-2016-0030.xml},
 }
 
@@ -602,7 +602,7 @@
 	number = {4},
 	publisher = {De Gruyter Open},
 	year = {2016},
-    pages = {37--61},
+	pages = {37--61},
 	url = {https://www.degruyter.com/downloadpdf/j/popets.2016.2016.issue-4/popets-2016-0028/popets-2016-0028.xml},
 }
 
@@ -614,7 +614,7 @@
 	number = {4},
 	publisher = {De Gruyter Open},
 	year = {2016},
-    pages = {4--20},
+	pages = {4--20},
 	url = {https://www.degruyter.com/downloadpdf/j/popets.2016.2016.issue-4/popets-2016-0026/popets-2016-0026.xml},
 }
 
@@ -671,8 +671,8 @@
 	number = {2},
 	publisher = {De Gruyter Open},
 	year = {2016},
-    pages = {175--192},
-    url = {https://www.degruyter.com/downloadpdf/j/popets.2015.2016.issue-2/popets-2016-0011/popets-2016-0011.xml},
+	pages = {175--192},
+	url = {https://www.degruyter.com/downloadpdf/j/popets.2015.2016.issue-2/popets-2016-0011/popets-2016-0011.xml},
 }
 
 @article{McPherson2016a,
@@ -683,7 +683,7 @@
 	number = {3},
 	publisher = {De Gruyter Open},
 	year = {2016},
-    pages = {212--225},
+	pages = {212--225},
 	url = {https://www.degruyter.com/downloadpdf/j/popets.2016.2016.issue-3/popets-2016-0024/popets-2016-0024.xml},
 }