diff --git a/docs/source/refs.bib b/docs/source/refs.bib
index 8c5a2d1da..383049df0 100644
--- a/docs/source/refs.bib
+++ b/docs/source/refs.bib
@@ -341,6 +341,7 @@ @book{James_2021_statlearning
   author    = {James, Gareth and Witten, Daniela and Hastie, Trevor and Tibshirani, Robert},
   title     = {An Introduction to Statistical Learning with Applications in RAn Introduction to Statistical Learning with Applications in R},
   year      = {2021},
+  publisher = {Springer},
   url       = {https://www.statlearning.com/}
 }