Rogers, Katherin. “Augustine’s Compatibilism.” Religious Studies, Vol. 40 (2004), pp. 415-435.  

Abstract:

“In analysing Augustine’s views on freedom it is standard to draw two distinctions; one between an earlier emphasis on human freedom and a later insistence that God alone governs human destiny, and another between pre-lapsarian and post-lapsarian freedom. These distinctions are real and important, but underlying them is a more fundamental consistency. Augustine is a compatibilist from his earliest work on freedom through his final anti-Pelagian writings, and the freedom possessed by the un-fallen and the fallen will is a compatibilist freedom. This leaves Augustine open to the charge that he makes God the ultimate cause of sin.”

Online:
Cambridge Journals Online