1. Aristotle, Books III–IV (the classification of constitutions)
2. Augustine, Books II, XIX
3. Aquinas, ; I-II Q. 90–97
4. Machiavelli, ; Book I
5. Hobbes, , Part II Chapters 17–21
6. Locke, , Chapters 7–19
7. Montesquieu, , Books II–VIII, XI
8. Rousseau, , Books I–III
9. Kant, , Part II (Doctrine of Right)
10. Hegel, , §257–320
11. Mill,
12. Marx, ; The Civil War in France