@misc{indiciaefa7126ee815a,
  title = {An auditory and visual time marker for classroom use.},
  author = {P J Coughlin},
  year = {1967},
  doi = {10.1080/14640746708400089},
  url = {https://pubmed.ncbi.nlm.nih.gov/6043058/},
  note = {Source identifier: 6043058}
}