diff --git a/paper/paper.bib b/paper/paper.bib
index 33959c61..aeb80544 100644
--- a/paper/paper.bib
+++ b/paper/paper.bib
@@ -88,6 +88,7 @@ @book{findleyCreepRelaxationNonlinear1989
   isbn = {978-0-486-66016-5},
   lccn = {TA418.2 .F48 1989},
   shorttitle = {Creep and Relaxation of Nonlinear Viscoelastic Materials},
+  doi = {10.1115/1.3424077},
   language = {en},
   publisher = {{Dover}},
   author = {Findley, William N. and Lai, James S. and Onaran, Kasif},