@article{Kruse1979,
author="Hans Kruse",
title="Tribal systems and social stratification: The case of North Yemen",
year="1979",
journal="Indian Journal of Political Science",
volume="40",
number="3",
pages="380-94",
keyword0="Customary",
keyword1="Law",
keyword2="Tribal",
keyword3="Tribes",
type="journal"
}