1. Attachment as related to mother-infant interaction;Ainsworth,2012
2. APPMA national pet owners survey 2008–2009;American Pet Products Manufacturers Association (APPMA),2009
3. American Pet Products Manufacturers Association (APPMA). National pet owners survey 2017-2018. http://www.americanpetproducts.org/pubs_survey.asp.
4. American Veterinary Medical Association (2015). Retrieved from www.avma.org/press/releases/040516_dog_bite.asp.
5. If your mother were an animal, what animal would she be? Creating play-stories in family therapy: The animal attribution story-telling technique;Arad;Family Process,2004