1. Biel, Gabriel (1984) Collectorium circa quattuor libros Sententiarum, ed. Wilfridus Werberg and Udo Hofman, Tübingen: Mohr Siebeck.
2. Ficino, Marsilio (1576) Liber de Sole, in his Opera omnia, I, Basel, Officina Henricpetrina, pp. 965–75.
3. Luther, Martin (1883–) Werke. Weimarer Ausgabe, Weimar: Böhlau.
4. Melanchthon, Philipp (1543) Physicae seu naturalis philosophiae compendium, Vatican City, Biblioteca Apostolica Vaticana, MS Palat. Lat. 1038 (Quoted from a photocopy held at the University Library of Heidelberg) [Cited as: Compendium].
5. — (1550) Commentarius de anima, Wittenberg: Haeredes Petri Setzij [Cited as: Commentarius].