Holland, Jurisprudence, ch. 6.

Kant, Philosophy of Law (Hastie's translation) 45-46.

Spencer, Justice, ch. 5-6.

Willoughby, Social Justice, ch. 2.

Paulsen, Ethics (Thilly's translation), ch. 9.

Gareis, Vom Begriff Gerechtigkeit.

Demogue, Notions fondamentales de droit privé, 119-135.

Picard, Le droit pur, liv. 9.

Pound, The End of Law as Developed in Legal Rules and Doctrines, 27 Harvard Law Review, 195.

Holmes, Common Law, Lect. 1.