References and further reading
- Day, M. J., Horzinek, M. C., Schultz, R. D., & Squires, R. A. (2016). WSAVA guidelines for the vaccination of dogs and cats. Journal of Small Animal Practice, 57, E1–E45.10.1111/jsap.2_12431
- Freedman, D. G., King, J. A., & Elliot, O. (1961). Critical period in the social development of dogs. Science, 133, 1016–1017.10.1126/science.133.3457.1016
- Zulch, H., & Mills, D. (2012). Life skills for puppies. Dorchester: Veloce Publishing.
- Mattinson, P. (2014). The happy puppy handbook. London: Ebury Publishing, Random House Group.