1 files changed, 5 insertions, 0 deletions

diff --git a/ref.bib b/ref.bib
index 8df5c0b..dc27913 100644
--- a/ref.bib
+++ b/ref.bib
@@ -21,4 +21,9 @@
     publisher = {Springer},
     doi = {10.1007/BFb0059147},
     langid = {english}
+}
+@book{riehl,
+    author = {Emily Riehl},
+    title = {Category Theory in Context},
+    langid = {english}
 }
\ No newline at end of file