@book{oai:ir.ide.go.jp:00040148,
 author = {Tsutomu, Takane},
 month = {},
 note = {SMW/631.1/Aj2, application/pdf, OPS004200_004},
 publisher = {Institute of Developing Economies (IDE-JETRO)},
 title = {3. Labor Use in Agricultural Production},
 year = {2008}
}