Sams teach yourself PL SQL in 21 days is better than these books

Though sams is a old book, and it some points it needs the explanation from another great book Rampant Press Easy Oracle PL SQL Jumpstart but to learn pl sql it is better than :

Oracle PL / SQL Programming (Animal Guide) by Steven Feuerstein

Oracle Database 11g PL / SQL Programming (O... by Michael McLaughlin

Oracle Database 10g PL / SQL Programming by Scott Urman


Oracle PL / SQL For Dummies by Michael Rosenblum

Beginning PL / SQL: From Novice to Professional (... by Donald Bales

Oracle PL / SQL by Example (4th Edition) by Benjamin Rosenzweig