diff --git a/refs.bib b/refs.bib
index 8974dd3..5f17ed5 100644
--- a/refs.bib
+++ b/refs.bib
@@ -308,4 +308,15 @@
   volume={16},
   year={2018},
   publisher={Edizioni della normale Pisa}
+}
+
+@article{GleasonProjective,
+  title={Projective topological spaces},
+  author={Gleason, Andrew M},
+  journal={Illinois Journal of Mathematics},
+  volume={2},
+  number={4A},
+  pages={482--489},
+  year={1958},
+  publisher={Duke University Press}
 }
\ No newline at end of file