Georg Wilhelm Friedrich Hegel, Hegel's Philosophy of Nature: Encyclopaedia of the Philosophical Sciences (1830), part 2 translated by A.V. Miller, illustrated, reissue, reprint Oxford University Press, 2005 ISBN0-19-927267-0, 978-0-19-927267-9, Google Books
Aristotle wrote that colour is a mixture of light and dark, since white light is always seen as somewhat darkened when it is seen as a colour. (Aristotle, On Sense and its Objects, III, 439b, 20 ff.: "White and black may be juxtaposed in such a way that by the minuteness of the division of its parts each is invisible while their product is visible, and thus colour may be produced.")
K. Barteczko and M. Jacob (1999). «A re-evaluation of the premaxillary bone in humans». Anatomy and Embryology. 207: 417–37. PMID14760532. doi:10.1007/s00429-003-0366-x
K. Barteczko and M. Jacob (1999). «A re-evaluation of the premaxillary bone in humans». Anatomy and Embryology. 207: 417–37. PMID14760532. doi:10.1007/s00429-003-0366-x
Coelho, Humberto Schubert (2007). A religião de goethe. Dissertação do Programa de Pós-graduação em Ciência da Religião. Universidade Federal de Juiz de Fora.
Coelho, Humberto Schubert (20 de junho de 2018). «O monismo complexificado de Schelling». Cadernos de Filosofia Alemã. 23 (1). Consultado em 30 de junho de 2019
Timm, Hermann: Gott und die Freiheit: Studien zur Religionsphilosophie der Goethezeit, Band 1: Die Spinozarenaissance. (Frankfurt am Main: Vittorio Klostermann, 1974)
