1. Almeida, A., Vasconcelos, C., & Strecht-Ribeiro, O. (2014). Attitudes toward animals: A study of Portuguese children. Anthrozoös, 27, 173–190.
2. Arrindell, W. A., Eisemann, M., Richter, J., Oei, T. P., Caballo, V. E., van der Ende, J., … Sica, C. (2003). Phobic anxiety in 11 nations: Part I: Dimensional constancy of the five-factor model. Behaviour Research and Therapy, 41, 461–479.
3. Cook, M., & Mineka, S. (1990). Selective associations in the observational conditioning of fear in rhesus monkeys. Journal of Experimental Psychology: Animal Behavior Processes, 16, 372–389.
4. Cook, M., & Mineka, S. (1991). Selective associations in the origins of phobic fears and their implications for behavior therapy. In P. Martin (Ed.), Handbook of behavior therapy and psychological science: An integrative approach (pp. 413–434). Oxford: Pergamon Press.
5. Darwin, C. (1872). The expression of the emotions in man and animals. London: Fontana Press.