 In addition, Sturm is acquainted with humanist thinkers, such as Lorenzo Valla, Juan Louis Vives, Philip Melanchthon, and Pierre de la Ramée. Furthermore, his sources include early modern natural philosophers: microscopists, such as Marcello Malpighi, Antonie Philips van Leeuwenhoek, and Nehemiah Grew, but also astronomers such as Nicolaus Copernicus, Tycho Brahe, Galileo Galilei. Sturm is also familiar with Renaissance and early modern physicians and anatomists such as Jean Fernel, William Harvey, Claude Perrault, and Jean Pecquet.