The three-year-old and his attachment to a special soft object.

@article{Boniface1979TheTA,
  title={The three-year-old and his attachment to a special soft object.},
  author={D Boniface and Philip Graham},
  journal={Journal of child psychology and psychiatry, and allied disciplines},
  year={1979},
  volume={20 3},
  pages={217-24}
}