Immanuel Kant
Kant, Immanuel. "Idee zu einer allgemeinen Geschichte in weltbürgerlicher Absicht [Idea for a Universal History with a Cosmopolitan Purpose]." Berlinische Monatsschrift, Nov. 1784.
Kant, Immanuel. Grundlegung zur Metaphysik der Sitten [Groundwork of the Metaphysic of Morals]. Riga: J. F. Hartknoch, 1785.
Kant, Immanuel. Groundwork of the Metaphysics of Morals, translated by Mary Gregor and Jes Timmermann. Cambridge University Press, 2012.
"Sapere aude" is a Latin phrase meaning "dare to know."
Kant, Immanuel. "Beantwortung der Frage: Was ist Aufklärung? [Answering the Question: What is Enlightenment?]." Berlinische Monatsschrift, Dec. 1784.
Kant, Immanuel. "An Answer to the Question: 'What is Enlightenment'?" Kant: Political Writings, edited by H. S. Reiss, translated by H. B. Nisbet. Cambridge University Press, 1991.
Kant, Immanuel. Critik der praktischen Vernuft [Critique of Practical Reason]. Riga: Johann Friedrich Hartknoch, 1788, conclusion.
Kant, Immanuel. Critique of Practical Reason, translated by Mary Gregor. Cambridge University Press, 2015, conclusion.
Groundwork of the Metaphysics of Morals
Kant, Immanuel. Grundlegung zur Metaphysik der Sitten [Groundwork of the Metaphysic of Morals]. Riga: J. F. Hartknoch, 1785.
Kant, Immanuel. Groundwork of the Metaphysics of Morals, translated by Mary Gregor and Jes Timmermann. Cambridge University Press, 2012.