Original: Basham , A.L. ( 1968 ) , Pacific Affairs , University of British Columbia , 641-643 There are differences in culture among the different ethnic groups in matters such as dress , food , and religion , especially where pre-Islamic customs differ from Islamic practices .
Simplified: Basham , A.L. ( 1968 ) , Pacific Affairs , University of British Columbia , 641-643 The different ethnic groups have differences in dress , food , and religion .