Spain and Catalonia – Not Just a Language Conflict

Catalan VS Castellano - ShBarcelona

Is Catalan Spanish? Comparing Catalan vs. Castilian Spanish

Essential Catalan Phrases to visit like a local

What's the Difference Between Spanish & Catalan? - Language Department

Barcelona Bound! – Erika Explores

Top Ten Origins: Catalonia (Catalunya) and Spain

What are the differences among Iberian languages like Catalan, Castillian, Leonese, Asturian, and with them, the differences among these nations? - Quora

Table 2 from Early phrasing patterns in Catalan and Spanish multi-word speech

Catalonia profile - BBC News

Catalan vs. Spanish: What's the difference? - Lingoda