diff --git a/vignettes/simulation.bib b/vignettes/simulation.bib
index 2cc220a..0632523 100644
--- a/vignettes/simulation.bib
+++ b/vignettes/simulation.bib
@@ -1,7 +1,6 @@
 @article{
  cook2006,
  ISSN = {10618600},
- URL = {https://www.jstor.org/stable/27594203},
  abstract = {This article presents a simulation-based method designed to establish the computational correctness of software developed to fit a specific Bayesian model, capitalizing on properties of Bayesian posterior distributions. We illustrate the validation technique with two examples. The validation method is shown to find errors in software when they exist and, moreover, the validation output can be informative about the nature and location of such errors. We also compare our method with that of an earlier approach.},
  author = {Samantha R. Cook and Andrew Gelman and Donald B. Rubin},
  journal = {Journal of Computational and Graphical Statistics},
@@ -17,7 +16,5 @@ @article{talts2020
       title={Validating Bayesian Inference Algorithms with Simulation-Based Calibration}, 
       author={Sean Talts and Michael Betancourt and Daniel Simpson and Aki Vehtari and Andrew Gelman},
       year={2020},
-      eprint={1804.06788},
-      archivePrefix={arXiv},
-      primaryClass={stat.ME}
-}
\ No newline at end of file
+      howpublished={https://arxiv.org/abs/1804.06788}
+}