We give a few exercises here for you to try your hand at constructing pushdown automata on your own.
The Theory of Computing
Finite State Automata, Rebular Languages, and Regular Expressions
Pushdown Automata and Context Free Languages
Overview of Pushdown Automata and Context Free Grammars
Pushdown Automata
Context Free Grammars and Languages
Our first PDA
Our Second PDA
Formally Defining PDA's
PDA Examples
PDA Exercises