Cicero the Philosopher: 12 Papers.

Jonathan G. F. Powell, (ed.) Cicero the Philosopher: 12 Papers. Oxford: Oxford University Press, 1995.

Overview:

–  Cicero may be best known as a politician, but he was also one of the few significant Roman writers of philosophy. Powell presents a new and exciting selection of current scholarly work on this neglected side of him, establishing Cicero firmly as a serious philosophical writer of continuing importance and relevance.

Online:
Barnes & Noble