This oxford handbook was edited by Julia Simner and Edward J. Hubbard, with the contribution of many leading scientists in the field of synesthesia. It is a compelling overview of what we know about synesthesia so far and in which directions and branches the research is evolving. This book is recommended to people that want to go deeper in their understanding and can handle the dense information found in this book.

Oxford Handbook of Synesthesia (Oxford Library of Psychology)