diff --git a/CITATION.cff b/CITATION.cff
index a6a00b8f..5c61b608 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -29,4 +29,4 @@ preferred-citation:
   title: "r2rtf---an R Package to Produce Rich Text Format (RTF) Tables and Figures"
   year: 2020
   collection-title: "PharmaSUG"
-  url: "https://www.pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf"
+  url: "https://pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf"
diff --git a/README.Rmd b/README.Rmd
index bc4b06c5..a0b97689 100644
--- a/README.Rmd
+++ b/README.Rmd
@@ -171,7 +171,7 @@ If you use this software, please cite it as below.
 
 > Wang, S., Ye, S., Anderson, K., & Zhang, Y. (2020).
 > r2rtf---an R Package to Produce Rich Text Format (RTF) Tables and Figures.
-> _PharmaSUG_. https://www.pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf
+> _PharmaSUG_. https://pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf
 
 A BibTeX entry for LaTeX users is
 
@@ -181,6 +181,6 @@ A BibTeX entry for LaTeX users is
   author    = {Wang, Siruo and Ye, Simiao and Anderson, Keaven M and Zhang, Yilong},
   booktitle = {PharmaSUG},
   year      = {2020},
-  url       = {https://www.pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf}
+  url       = {https://pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf}
 }
 ```
diff --git a/inst/CITATION b/inst/CITATION
index 35812750..e3368a8a 100644
--- a/inst/CITATION
+++ b/inst/CITATION
@@ -4,5 +4,5 @@ bibentry(
   author = "Siruo Wang and Simiao Ye and Keaven M Anderson and Yilong Zhang",
   booktitle = "PharmaSUG",
   year = "2020",
-  url = "https://www.pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf",
+  url = "https://pharmasug.org/proceedings/2020/DV/PharmaSUG-2020-DV-198.pdf",
 )