Ridpath, Ian (1985). "Saying Hallo to Halley". Revised extracts from "A Comet Called Halley" by Ian Ridpath, published by Cambridge University Press in 1985. สืบค้นเมื่อ 2015-05-08.
merriam-webster.com
"Halley". Merriam–Webster Online. สืบค้นเมื่อ 21 December 2009.