Russell John. Oracle PL/SQL User’s Guide and Reference

Contains information: Language Overview, Fundamentals, Datatypes, Control Structures, Collections and Records, Interaction Between PL/SQL and Oracle, Handling Errors, Subprograms, Packages, Object Types, Native Dynamic SQL, Tuning Applications, Language Elements, Sample Programs, CHAR versus VARCHAR2 Semantics, Wrap Utility, Name Resolution , Program Limits, List of Reserved Words.