Olsen, Michael Kevin. «Limitations of the influence of English phonetics and phonology on L2 Spanish rhotics». Borealis – An International Journal of Hispanic Linguistics 5, no. 2 (diciembre 1, 2016): 313–331. Accedido agosto 20, 2026. https://septentrio.uit.no/index.php/borealis/article/view/3898.