Martin Maiden 
Linguistic History of Italian, A [PDF ebook] 

A Linguistic History of Italian offers a clear and concise explanation of why modern Italian grammar has become the way it is. It focuses on the effects of historical changes on the modern structure of Italian, revealing patterns and structures which are not always apparent to those who are only familiar with modern Italian. Although the book concentrates on the internal history of the language, the emergence of Italian is considered against the wider background of the history of italian dialects, and other external factors such as cultural and social influences are also examined.