@book{Serjeant1983,
author="Robert B. Serjeant and David A. King and Ismail al-Akwa",
title="Calendars, the time of day and mathematical astronomy",
year="1983",
booktitle="Sana'a: An Arabian Islamic City",
editor="R.B. Serjeant",
publisher="World of Islam Festival Trust",
address="London",
pages="32-35",
keyword0="Calendars",
keyword1="Holidays",
type="chapter"
}