@book{Serjeant1989, author="Robert B. Serjeant", title="Yafi, Zaydis, Al Bu Bakr b. Salim and others: Tribes and Sayyids", year="1989", booktitle="On Both Sides of Al-Mandab: Ethiopia, South-Arabic and Islamic Studies Presented to Oscar Löfgren on his ninetieth birthday 13 May 1988", publisher="Swedish Research Institute in Istanbul", edition="Transactions Vol. 2", address="Istanbul", pages="83-105", keyword0="Aramawt", keyword1="Customary", keyword2="Hijrah", keyword3="History", keyword4="Law", keyword5="Tribes", keyword6="Yafi", type="chapter" }