@article{oai:minpaku.repo.nii.ac.jp:00003147,
 author = {Griffin, P. Bion},
 journal = {Senri Ethnological Studies},
 month = {Mar},
 pages = {199--222},
 title = {Philippine Agta Forager Serfs : Commodities and Exploitation},
 volume = {30},
 year = {1991}
}