1. C. Anagnostakis, 1984 : The Arabic Version of Ptolemy's Planispharium . New Haven, Conn.: Yale UniversityPh.D. Thesis .
2. ANI, 1991 : "Habash's Analemma for Azimuth Circles on Astrolabes", to appear inZeitschrift fur Geschichte der Arabisch-Islamischen Wissenschaften 7.