Robertson, J. (1956) A mother’s observations on the tonsillectomy of her four-year-old daughter . The Psychoanalytic Study of the Child 11:410-433.
Bowlby, J., Robertson, J., and Rosenbluth, D. (1952) “A Two-Year-Old Goes to Hospital”. The Psychoanalytic Study of the Child 7:82-94. (film)