Although many different turnarounds are possible in this style I have concentrated on what is probably the most common sequence for bars 11 and 12.
| A / D / | A / E7 / |
Example 1 - is just using the root notes from the chords
to get you started.
Example 2 - is using the same root notes with "filling" in between.
Example 3 - is demonstrating using notes other than the basic root notes.i.e. using an E note for the A chord (strong notes for A chord = A - C# - E )