The DSM is the main classification manual used in the diagnosis of mental disorders. This link will take you to the online version. Please note that dyslexia can be found under "Learning Difficulties".
The SAGE Handbook of Dyslexia is a comprehensive overview of a complex field. It is a rich, critical assessment of past and present theory and current research, which also looks to the future. The editors have brought together key figures from the international academic world - both researchers and practitioners - to examine the relationships between theoretical paradigms, research and practice, and to map new areas of research.
Dr. Selikowitz has written a sympathetic guide to the often-controversial subject of dyslexia and other learning disorders, and deals with academic problems as well as more subtle difficulties such as clumsiness.
This book covers key aspects of learning in adults with dyslexia, including individual profiles, strengths and difficulties, the role of the tutor, course design, assessment, and method of teaching, as well as providing a number of support strategies. Case studies highlight the needs of employers and dyslexic adults in the workplace and give examples of good practice.
Large collection of encyclopedias and dictionaries. It includes some important reference works in History, Philosophy, Religious Studies, and related fields. Works tend to feature shorter entries, with exceptions.