
https://www.brookings.edu/wp-content/uploads/2023/09/6_Moll-et-al_unembargoed_updated.pdf

https://towardsdatascience.com/analyzing-global-literacy-rates-data-in-r-88062f813ad2

https://www.oecd-ilibrary.org/docserver/9789264293083-en.pdf?expires=1529901663&id=id&accname=guest&checksum=4A5E0B0C79A72EF7A887DDB0119B4594