1. Bowlby, J. (1969). Attachment. Attachment and loss: Vol 1. Attachment. Basic Books.
2. Bowlby, J. (1951). Maternal care and mental health. Monograph series, 2. World Health Organisation.
3. Bowlby, J. (1944). Forty-four juvenile thieves: Their characters and home-life (II). International Journal of Psycho-Analysis, 25, 107–128.
4. Crittenden, P. M. (2017). Gifts from Mary Ainsworth and John Bowlby. Clinical Child Psychology and Psychiatry, 22(3), 436–422. https://doi.org/10.1177/1359104517716214
5. Baker, M. (2010, December 17). Harlow’s studies on dependency in monkeys [video file]. YouTube. https://youtu.be/OrNBEhzjg8I