1. ^{{cite book|last1=Stoyan|first1=Ronald|title=Atlas of Great Comets|date=2015|publisher=Cambridge University Press|isbn=9781316195727|page=63|url=https://books.google.co.uk/books?id=VEF5BgAAQBAJ&pg=PA63|language=en}}
2. ^{{cite book|last1=Omodeo|first1=Pietro Daniel|title=Copernicus in the Cultural Debates of the Renaissance: Reception, Legacy, Transformation|date=2014|publisher=BRILL|isbn=9789004254503|page=141|url=https://books.google.co.uk/books?id=mUr3AwAAQBAJ&pg=PA141|language=en}}
3. ^{{cite book|last1=Walsh|first1=Robert|title=The American Quarterly Review|date=1828|publisher=Carey, Lea & Carey|page=494|url=https://books.google.co.uk/books?id=kNYRAAAAYAAJ&pg=PA494|language=en}}
4. ^{{cite web|title=The familiar and the fantastic: The historie of foure-footed beastes by Edward Topsell, 1607.|url=https://www.rcseng.ac.uk/library-and-publications/library/blog/the-familiar-and-the-fantastic/|website=Royal College of Surgeons|accessdate=3 April 2018|language=en}}
5. ^{{cite web|title=The Galileo Project|url=http://galileo.rice.edu/Catalog/NewFiles/monte.html|website=galileo.rice.edu|accessdate=3 April 2018}}
6. ^{{cite web|title=The Theater that was Rome - Biography|url=https://library.brown.edu/projects/rome/people/0120/|website=library.brown.edu|accessdate=3 April 2018}}
7. ^{{cite web|title=Bartholomew Gosnold - English explorer|url=https://www.britannica.com/biography/Bartholomew-Gosnold|website=Encyclopedia Britannica|accessdate=3 April 2018|language=en}}
8. ^{{cite web|title=Georg Bartisch (1535-1607)|url=http://data.bnf.fr/15059162/georg_bartisch/|website=data.bnf.fr|accessdate=3 April 2018|language=en}}