References updated

Author: Michael Sh

README.md

@@ -75,6 +75,7 @@ func main() {
 
 ## References
 
+- [IAGA V-MOD WG and main IGRF website](https://www.ncei.noaa.gov/products/international-geomagnetic-reference-field)
 - [Alken, P., Thébault, E., Beggan, C.D. et al. International Geomagnetic Reference Field: the thirteenth generation. Earth Planets Space 73, 49 (2021).](https://rdcu.be/cKqZv) https://doi.org/10.1186/s40623-020-01288-x
-
+- [International Association of Geomagnetism and Aeronomy. (2024). IGRF-14. Zenodo.](https://doi.org/10.5281/zenodo.14012302)
 - Implementation is based on [geomag70.c](https://www.ngdc.noaa.gov/IAGA/vmod/geomag70_linux.tar.gz). [License information](https://www.ngdc.noaa.gov/IAGA/vmod/geomag70_license.html).