diff --git a/README.md b/README.md
index 8b1a79a7..a5499bd8 100644
--- a/README.md
+++ b/README.md
@@ -72,12 +72,14 @@ to the above cmake command.
 
 ## References
 
-Hartnett, E., Ator, J, Lei, H., Richert, A., Woollen, J., King, A.,
-Hartnett, A., [NCEPLIBS GRIB and BUFR Libraries: Maintaining and
-Modernizing NOAA's Libraries for WMO Data
-Formats](https://www.researchgate.net/publication/376390180_NCEPLIBS_GRIB_and_BUFR_Libraries_Maintaining_and_Modernizing_NOAA's_Libraries_for_WMO_Data_Formats),
-American Geophysical Union (AGU) 2023. (See also
-[poster](https://www.researchgate.net/publication/376582005_Poster_-_IN51B-0416_NCEPLIBS_GRIB_and_BUFR_Libraries_Maintaining_and_Modernizing_NOAA's_Libraries_for_WMO_Data_Formats)).
+- WMO, [Manual on Codes (WMO No. 306), Volume I.2, Part B - Binary Codes](https://library.wmo.int/idurl/4/35625)
+- Hartnett, E., Ator, J., Lei, H., Richert, A., Woollen, J., King, A.,
+  Hartnett, A., [NCEPLIBS GRIB and BUFR Libraries: Maintaining and
+  Modernizing NOAA's Libraries for WMO Data
+  Formats](https://www.researchgate.net/publication/376390180_NCEPLIBS_GRIB_and_BUFR_Libraries_Maintaining_and_Modernizing_NOAA's_Libraries_for_WMO_Data_Formats),
+  American Geophysical Union (AGU) 2023. (See also
+  [poster](https://www.researchgate.net/publication/376582005_Poster_-_IN51B-0416_NCEPLIBS_GRIB_and_BUFR_Libraries_Maintaining_and_Modernizing_NOAA's_Libraries_for_WMO_Data_Formats)).
+- Ator, J., [Testing NCEPLIBS-bufr](https://ftp.emc.ncep.noaa.gov/static_files/public/testing_NCEPLIBS-bufr.pdf)
 
 ## Disclaimer