@misc{indiciae7a2d300e2183,
  title = {Norms for development.},
  author = {R S Illingworth},
  year = {1986},
  doi = {10.1111/j.1469-8749.1986.tb03840.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/3949081/},
  note = {Source identifier: 3949081}
}