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diff --git a/sociology.bib b/sociology.bib
index c753ede..c34e323 100644
--- a/sociology.bib
+++ b/sociology.bib
@@ -646,3 +646,11 @@
   volume    = "",
   url       = "",
 }
+
+@book{berger1991,
+  title     = {The Social Construction of Reality: A Treatise in the Sociology of Knowledge},
+  author    = {Peter L. Berger and Thomas Luckmann},
+  publisher = {Penguin Books Ltd},
+  isbn      = {0140135480; 9780140135480},
+  year      = {1991},
+}