@misc{indiciaeac83b66bda1d,
  title = {The frontier within.},
  author = {S J BECK},
  year = {1949},
  doi = {10.1111/j.1939-0025.1949.tb06513.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/15391829/},
  note = {Source identifier: 15391829}
}