@misc{indiciaea28e7b334b0b,
  title = {Crawling-onset age predicts visual cliff avoidance in infants.},
  author = {J E Richards and N Rader},
  year = {1981},
  doi = {10.1037//0096-1523.7.2.382},
  url = {https://pubmed.ncbi.nlm.nih.gov/6453931/},
  note = {Source identifier: 6453931}
}