Lexicon Caesarianum 2 (Latín)
Catalogo Gredos
Descriptors Level III (1)
DELGADILLO, Hugo. Repertorio Ornamental de La Arquitectura de Epoca Republicana en Bogota. 2008.
K. OLSEN, Michael. the L2 Acquisition of Spanish Rhotics by LI English Speakers the Effect of LI Articulatory Routines and Phonetic Context for Allophonic Variation