With 21 revised and updated chapters, Fonética y fonología, 4th Edition continues with three principal aims that characterized its successful previous editions. First, it provides an unparalleled introduction to phonetics and phonology. Second, the text allows students, native English speakers, to acquire semi-native pronunciation. Third, it offers to students their first introduction to dialectic phonetic variations of Latin American Spanish and peninsular Spanish. Adding new co-author, Ana Ameal-Guerra, a native of Galicia, Spain, amplifies various sections about peninsular dialects and other varieties in the Spanish speaking world.
While I found this book to be generally helpful in my studies, I think the much more helpful portion of the learning package is Schwegler's website which provides written, auditory, and visual practice tools for all the concepts covered. I would recommend this book for someone interested in understanding Spanish phonology or tweaking their Spanish to match a particular region/style, but be warned that the book is really dense with information and pronunciation techniques rather than research or historical contextualization.