@misc{indiciae8479bf644752,
  title = {External validity and experimental design: the sensitive phase for song learning.},
  author = {DA Nelson},
  year = {1998},
  doi = {10.1006/anbe.1998.0805},
  url = {https://pubmed.ncbi.nlm.nih.gov/9787040/},
  note = {Source identifier: 9787040}
}