@misc{indiciae28c3a4502b6f,
  title = {Letter: Closed shop.},
  author = {J R Lang and G W Burgess},
  year = {1975},
  doi = {10.1136/bmj.1.5948.42-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/1120246/},
  note = {Source identifier: 1120246}
}