Donald Kagan's The Peloponnesian War is a good place to start. If you are able to get a hold of it I cant recommend Kenneth Harl's Teaching Company course on the Pelopennesian War highly enough. Particularly for background and his analysis of the work of Kagan and Geoffrey de Ste. Croix who are two of the leading scholars of the field

Finally always remember that friends don't let friends read Victor Davis Hansen.

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