1. Ainsworth MDS, Wittig BA (1969) Attachment and exploratory behaviour of one-year olds in a strange situation. In B M Foss (Ed.), Determinants of infant behavior (Vo1. 4: 111–136). London: Methuen.
2. Bowlby J (1972) Attachment. Middlesex, England: Penguin Books.
3. Bowlby J (1973) Attachment and loss: Vol. 2. Separation. New York, NY: Basic Books.
4. Cassidy J, Ehrlich KB, Sherman LJ (2012) Child-parent attachment and response to threat: A move from the level of representation. In Mikulincer M & Shaver PR (Eds.), Nature and development of social connections: From brain to group. Washington, DC.
5. Attachment behavior in dogs (Canis familiaris): A new application of Ainsworth's (1969) Strange Situation Test;J Topál;J Comp Psychol,1998