@misc{indiciaea68360faf215,
  title = {Age differences in productive activities.},
  author = {A R Herzog and R L Kahn and J N Morgan and J S Jackson and T C Antonucci},
  year = {1989},
  doi = {10.1093/geronj/44.4.s129},
  url = {https://pubmed.ncbi.nlm.nih.gov/2738316/},
  note = {Source identifier: 2738316}
}