Bergman, Ronald A.; Afifi, Adel K.; Miyauchi, Ryosuke (2005). "Circle of Willis". Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System: Arteries: Head, Neck, and Thorax. 21 Eylül 2019 tarihinde kaynağından arşivlendi. Erişim tarihi: 14 Ocak 2020.
Uston, Cagatay (9 Mart 2005). "NEUROwords Dr. Thomas Willis' Famous Eponym: The Circle of Willis". Journal of the History of the Neurosciences. 14 (1). ss. 16-21. doi:10.1080/096470490512553. PMID15804755.
Boorder, Michiel J.; Grond, Jeroen; Dongen, Alice J.; Klijn, Catharina J.M.; Jaap Kappelle, L.; Rijk, Peter P.; Hendrikse, Jeroen (24 Ekim 2006). "Spect measurements of regional cerebral perfusion and carbondioxide reactivity: Correlation with cerebral collaterals in internal carotid artery occlusive disease". Journal of Neurology. 253 (10). ss. 1285-1291. doi:10.1007/s00415-006-0192-1. PMID17063318.
Uston, Cagatay (9 Mart 2005). "NEUROwords Dr. Thomas Willis' Famous Eponym: The Circle of Willis". Journal of the History of the Neurosciences. 14 (1). ss. 16-21. doi:10.1080/096470490512553. PMID15804755.
Boorder, Michiel J.; Grond, Jeroen; Dongen, Alice J.; Klijn, Catharina J.M.; Jaap Kappelle, L.; Rijk, Peter P.; Hendrikse, Jeroen (24 Ekim 2006). "Spect measurements of regional cerebral perfusion and carbondioxide reactivity: Correlation with cerebral collaterals in internal carotid artery occlusive disease". Journal of Neurology. 253 (10). ss. 1285-1291. doi:10.1007/s00415-006-0192-1. PMID17063318.
Purves, Dale; George J. Augustine; David Fitzpatrick; William C. Hall; Anthony-Samuel LaMantia; James O. McNamara (2008). Neuroscience (4.4yazar7=Leonard E. White bas.). Sinauer Associates. ss. 834-5. ISBN978-0-87893-697-7. 27 Eylül 2011 tarihinde kaynağından arşivlendi.
web.archive.org
Purves, Dale; George J. Augustine; David Fitzpatrick; William C. Hall; Anthony-Samuel LaMantia; James O. McNamara (2008). Neuroscience (4.4yazar7=Leonard E. White bas.). Sinauer Associates. ss. 834-5. ISBN978-0-87893-697-7. 27 Eylül 2011 tarihinde kaynağından arşivlendi.
Bergman, Ronald A.; Afifi, Adel K.; Miyauchi, Ryosuke (2005). "Circle of Willis". Illustrated Encyclopedia of Human Anatomic Variation: Opus II: Cardiovascular System: Arteries: Head, Neck, and Thorax. 21 Eylül 2019 tarihinde kaynağından arşivlendi. Erişim tarihi: 14 Ocak 2020.