@book{oai:ynu.repo.nii.ac.jp:00006327,
 author = {Malthus, T. R.},
 month = {},
 note = {application/pdf},
 title = {An essay on the principle of population; a view of its past and present effects on human happiness; with an inquiry into our prospects respecting the future removal or  mitigation of the evils which it occasions.},
 year = {1803}
}