@book{ BA01306407,
  author    = "Alfonso, Amelia B. and Layo, Leda L. and Bulatao, Rodolfo A.",
  title     = "Culture and fertility : the case of the Philippines",
  publisher = "Institute of Southeast Asian Studies",
  year      = "1980",
  series    = "Research notes and discussions paper",
  number    = "no. 20",
  URL       = "https://ci.nii.ac.jp/ncid/BA01306407"
}