- http://www.simplypsychology.org/wundt.html
- https://www.britannica.com/science/functionalism-psychology
- http://www.simplypsychology.org/biological-psychology.html
- http://www.biography.com/people/sigmund-freud-9302400
- http://study.com/academy/lesson/cross-cultural-psychology-definition-history-issues.html
- https://www.psychologie.uni-heidelberg.de/ae/allg/mitarb/ms/cross-cultural%20psy.pdf
- https://chela-kahama.blogspot.com/2015/01/advantages-and-disadvantages-of-cross.htmlhttp://web.cortland.edu/andersmd/HUMAN/CRITIC.HTML
- https://www.sciencedaily.com/terms/evolutionary_psychology.htm