Spanish language (Simple English Wikipedia)

Michelena, Luis, and de Rijk, Rudolf P.G. (February 19, 2009). "Basque Language". Encyclopaedia Britannica. Encyclopaedia Britannica, Inc.{{cite web}}: CS1 maint: multiple names: authors list (link)
Sala, Marius; Posner, Rebecca (November 30, 2015). "Portuguese Language". Encyclopaedia Britannica. Encyclopedia Britannica Inc.

census.gov (Global: 18^th place; Simple English: 7^th place)

Fernández Vítores, David (2021): El español: una lengua viva – Informe 2021 (PDF) (Report). Instituto Cervantes. 2020. Archived (PDF) from the original on 18 February 2020. Retrieved 14 December 2020.

"Belize". The World Factbook. United States Central Intelligence Agency. November 10, 2016. Archived from the original on May 13, 2013. Retrieved November 30, 2016.
"Brazil". The World Factbook. United States Central Intelligence Agency. November 10, 2016. Archived from the original on December 22, 2015. Retrieved November 30, 2016.
"Brazil". The World Factbook. United States Central Intelligence Agency. November 10, 2016. Archived from the original on August 31, 2020. Retrieved November 30, 2016.

"Ibero-Romance Languages". Project Gutenberg Self-Publishing Press. World Heritage Encyclopedia.^{[permanent dead link]}

Fernández Vítores, David (2021): El español: una lengua viva – Informe 2021 (PDF) (Report). Instituto Cervantes. 2020. Archived (PDF) from the original on 18 February 2020. Retrieved 14 December 2020.
"Belize". The World Factbook. United States Central Intelligence Agency. November 10, 2016. Archived from the original on May 13, 2013. Retrieved November 30, 2016.
"Brazil". The World Factbook. United States Central Intelligence Agency. November 10, 2016. Archived from the original on December 22, 2015. Retrieved November 30, 2016.
"Brazil". The World Factbook. United States Central Intelligence Agency. November 10, 2016. Archived from the original on August 31, 2020. Retrieved November 30, 2016.