books.google.es - "The brilliantly expressive clay models created by Gian Lorenzo Bernini (1598-1680) as "sketches" for his works in marble offer extraordinary insights into his creative imagination. Although long admired, the terracotta models have never been the subject of such detailed examination. This publication...https://books.google.es/books/about/Bernini.html?hl=es&id=6dr1bq99nDgC&utm_source=gb-gplus-shareBernini
