Are you looking for primary sources or secondary sources? If primary sources, then I did a quick summary of the ancient sources on Caesar's assassination a couple of months ago that may give you some pointers.

If it's modern treatments you're after, I can't give the best recommendations. But it'd be a good idea to have an acquaintance with the ancient sources anyway. The first three are the most important -- Suetonius, Plutarch, and Appian.

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