Abetti, Giorgio. The History of Astronomy. New York: Abelard-Schuman, 1952. Print.

Eagleton, Catherine. "Chaucer’s Own Astrolabe: Text, Image And Object." Studies In History And Philosophy Of Science 38. Objects, texts and images in the history of science (2007): 303-326. Science Direct. Web. 9 Feb. 2015.

Goldman, Joshua Aaron. Chaucer and the Medieval Sciences. Massachusetts: Massachusetts Institute of Technology, 1972. Print.

Lewis, C.S. The Discarded Image. United Kingdom: Cambridge University Press, 1964. Print.

Lucas, Angela. "Astronomy, Astrology, and Magic in Chaucer's Franklin's Tale." The Maynooth Review / Revieú Mhá Nuad 1983: 5. JSTOR Journals. Web. 9 Feb. 2015.

North, J.D. Chaucer’s Universe. United Kingdom: Oxford University Press, 1988. Print.

Parr, Johnstone, and Nancy Ann Holtz. "The Astronomy-Astrology in Chaucer's 'The Complaint of Mars'." The Chaucer Review 1981: 255. JSTOR Journals. Web. 9 Feb. 2015.

Smyser, Hamilton M. "A View of Chaucer's Astronomy." Speculum 1970: 359. JSTOR Journals. Web. 9 Feb. 2015.

Ward, Michael. Planet Narnia. United Kingdom: Oxford University Press, 2010. Print.