Bartleby.com
“Great Books Online”
Digital Books Index Links to free and commercially available e-books.
eBrary eBooks - Nearly 100,000 books in all academic subject areas.
PsycBOOKS
Classics in the field of psychology, out of print books and a selection of titles published by the American Psychological Association.
Springer Behavioral Science Collection
search the library catalog and limit to "online."