Kant's Critique of pure reason: background source materials

Christian Wolff: Rational thoughts on God, the world and the soul of human beings; also all things in general (1720) / Wolff

Martin Knutzen: System of efficient causes (1735) ; Philosophical treatise on the immaterial nature of the soul (1744) / Knutzen

Alexander Baumgarten: Metaphysics (1739) / Baumgarten

Christian August Crusius: Sketch of the necessary truths of reason (1745) / Crusius

Leonhard Euler: Letters to a German princess (1760-1762) / Euler

Johann Heinrich Lambert: treatise on the criterion of truth (1761) ; New organon (1764) / Lambert

Marcus Herz: First letter (1770) / Herz ; Second letter (1771) / Kant ; Third letter (1771) / Herz ; Observations from speculative philosophy (1771) / Herz ; Fourth letter (1772) ; Fifth letter (1776) / Kant

Johann August Eberhard: Universal theory of thinking and sensing (1776)

Johann Nicolaus Tetens: philosophical essays on human nature and its development (1777) / Tetens.