1. Ainsworth, M. (1967). Infancy in Uganda: Infant care and the growth of love. Oxford, UK: Johns Hopkins Press.
2. American Academy of Pediatrician. (2011). Toilet training. Retrieved from:
https://www2.aap.org/sections/scan/practicingsafety/Modules/ToiletTraining/ToiletTraining.pdf
3. Andrews, C. (2016). Ancient Roman daily life: Ten ancient Roman facts, figures, and features you never knew you needed to know. Retrieved from
http://www.explore-italian-culture.com/ancient-roman-daily-life-2.html
4. Antony, M. M., & Roemer, L. (2011). Behavior therapy: Traditional approaches. In S. B. Messer, A. S. Gurman, S. B. Messer, & A. S. Gurman (Eds.), Essential psychotherapies: Theory and practice (3rd ed.pp. 1–36). New York, NY: Guilford Press.
5. Azrin, N. H., & Foxx, R. M. (1971). A rapid method of toilet training the institutionalized retarded. Journal of Applied Behavior Analysis, 4, 89–99.