@inbook {113031,
	title = {Astrolabes and Medieval Travel},
	booktitle = {The Art, Science, and Technology of Medieval Travel},
	year = {2008},
	pages = {181-210},
	publisher = {Ashgate},
	organization = {Ashgate},
	address = {Aldershot, UK},
	author = {Sara J. Schechner}
}
