"The Reformed Doctrine of Predestination" by Loraine Boettner (available free at CCEL)
"Freedom of The Will" by Jonathan Edwards (available free at CCEL)
"Evangelism and the Sovereignty of God" by J.I. Packer (Amazon)
And finally... From the most important resource...
“Are not two sparrows sold for a penny? And not one of them will fall to the ground apart from your Father. But even the hairs of your head are all numbered. Fear not, therefore; you are of more value than many sparrows.” (Matthew 10:29-31)