Cicero: The Republic, The Laws.

Marcus Tullius Cicero, Cicero: The Republic, The Laws. Translated by Niall Rudd; Introduction and notes by J. G. F. Powell. Oxford: Oxford University Press, 1998.  

De Re Publica.

Marcus Tullius Cicero, De Re Publica. Edited by Konrat Ziegler. Leipzig: B. G. Teubner, 1969.

Cicero: De Re Publica and De Legibus.

Marcus Tullius Cicero,  De Re Publica and De Legibus, Edited and Translated by Clinton Walker Keyes. The Loeb Classical Library. Cambridge, MA: Harvard University Press, 1928.