The effects of mother-child separation: a follow-up study.

@article{Ainsworth1956TheEO,
  title={The effects of mother-child separation: a follow-up study.},
  author={Mary D. Salter Ainsworth and M. D. Boston and John Bowlby and Dr. Jack Rosenbluth},
  journal={The British journal of medical psychology},
  year={1956},
  volume={29 3-4},
  pages={211-47}
}