Fidelity Lancaster & William Lancaster 
People, Land and Water in the Arab Middle East [PDF ebook] 
Environments and Landscapes in the Bilad ash-Sham

The result of twenty-five years of research with different tribal groups in the Arabian peninsula, this study focuses on ethnographic descriptions of Arab tribal societies in five regions of the peninsula, with comparative material from others. Having become aware of the depth in time of Arab tribal structures, the authors have developed a view of Arabic tribal discourse where 'tribe’ is seen as essentially an identity that confers access to a social structure and its processes.