@misc{indiciae7db5e8b776b7,
  title = {Vertical vs horizontal presentations in the visual cliff apparatus.},
  author = {C Z Somervill and J W Somervill},
  year = {1977},
  doi = {10.2466/pms.1977.45.1.18},
  url = {https://pubmed.ncbi.nlm.nih.gov/905077/},
  note = {Source identifier: 905077}
}