diff --git a/bibliobase.bib b/bibliobase.bib
index 838b632..d688d3c 100644
--- a/bibliobase.bib
+++ b/bibliobase.bib
@@ -69028,3 +69028,11 @@ author = {Leslie London},
   url = {http://archive.indianstatistics.org/datadocuments/mcsinghi_iip_asi.pdf},
 }
 
+@book{eunsullee,
+  title={Analyzing complex survey data},
+  author={Lee, Eun Sul and Forthofer, Ronald N},
+  volume={71},
+  year={2005},
+  publisher={Sage Publications}
+}
+