On the Laws (Latin: De Legibus) is a dialogue by Cicero written about 51 BC, which survives only in fragmentary form. In contrast to his other major political dialogue, the De Re Publica, Cicero gave On the Laws a contemporary setting, portraying a conversation between himself, his brother Quintus, and his friend Atticus, about the appropriate constitution for an ideal Roman state. The system which emerges reflects Cicero's pragmatic conservatism. It is defended in terms of an early and influential conception of natural law.
On the Laws at online book stores: Amazon
Free online texts
Internet Archive: The treatises of M.T. Cicero: On the nature of the gods; On divination; On fate; On the republic; On the laws; and On standing for the consulship. Literally translated chiefly by the editor, C.D. Yonge (1878). Multiple formats.
Latin Library: De Legibus. Latin text, HTML format.
Online Library of Liberty: The Political Works of Marcus Tullius Cicero, vol. 2 (Treatise on the Laws), translated by Francis Barham (1841). Multiple formats.
Perseus: De Legibus. Latin text, HTML and XML format.
Wikisource: De Legibus. Latin text, multiple formats.
History of Philosophy without any gaps: Rhetorical Questions: Cicero - podcast by philosopher Peter Adamson.
History of Philosophy without any gaps: Raphael Woolf on Cicero - podcast by philosopher Peter Adamson.
Internet Encyclopedia of Philosophy: Cicero.
Stanford Encyclopedia of Philosophy: Ancient Political Philosophy.
Librivox: On the Laws - public domain audiobook.
The Great Conversation: Further reading at Tom's Learning Notes
Cicero: De Re Publica.
Plato: The Republic.
Plato: The Laws.
Latin resources: Learn to read Latin texts in the original.