Amazon.com description: Product Description: Professionals, families, and students can rely on this fully illustrated, comprehensive resource for all of their disability reference needs. Along with extensive coverage of genetics, heredity, pre- and postnatal development, specific disabilities, family roles, and intervention, this edition features new chapters on substance abuse, AIDS, Down syndrome, fragile X syndrome, behavior management, transitions to adulthood, and health care in the 21st century. It also reveals the causes of many conditions that can lead to developmental disabilities. The convenient selection of appendices includes a new one that describes the properties and uses of a wide variety of medications.