1. Hume, D. (1978/2000). A Treatise of Human Nature. 2nd edit., ed. L.A. Selby-Bigge, revised by P.H. Nidditch. Oxford: Oxford University Press.
2. Husserl, E. (1973). Ding und Raum: Vorlesungen 1907, In U. Claesges (Ed.), Husserliana XVI. The Hague: Martinus Nijhoff.
3. Husserl, E. (1997). Thing and Space: Lectures of 1907. Trans. R. Rojcewicz, Dordrecht: Kluwer Academic Publishers.
4. Kant, I. (1990). Kritik der reinen Vernunft, ed. R. Schmidt. Hamburg: Felix Meiner Verlag.
5. Kant, I. (1965). Critique of Pure Reason. Trans. N.K. Smith, New York: St. Martin's Press.