"Variedades de la lengua española is a valuable resource for both Spanish instructors and students. More specifically, it would benefit those advanced undergraduate students who possess an interest in Hispanic sociolinguistics. ... [Variedades de la lengua española] has the potential to serve along side a primary text as a complementary resource in advanced university Spanish courses. The inclusion of Sugerenicas para investigar y debatir, that concludes each chapter, encourages students to think critically about each topic and go beyond the text to inquire into the particulars of each dialect. ... In sum, Moreno-Fernández achieves the goal of presenting a detailed, yet concisely and clearly written volume on language variation found across the Spanish-speaking world."Nicholas M. Blaker, Hispania (Sept. 2021), USA