Manuvu Social Organization - E. Arsenio Manuel - Google Books

http://books.google.de/books?id=e2VwAAAAMAAJ&q=Sororate+rule&dq=Sororate+rule&hl=de&ei=dS7QTN7SNYfwsgaOwKGcAg&sa=X&oi=book_resul

"This study sets out to investigate the social system of a pagan group in central Mindanao which has never attracted attention previously. The intention is to describe the Manuvu' social system as it functions in the ethnographic present and as it has…