PL/SQL User's Guide and Reference
Release 2 (9.2)
http://download.oracle.com/docs/cd/B10501_01/appdev.920/a96624/toc.htm
Oracle® Database SQL Reference
10g Release 2 (10.2)
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/toc.htm
Oracle® Database Concepts
10g Release 2 (10.2)
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/toc.htm