According to APA rules a reference title should be in sentence case which means only capitalise the first letter of the title and subtitle with the exception of proper nouns ( e.g. Maslow's hierarchy of needs). Use lowercase for anything else. In general do not capitalise the names of diseases, disorders, therapies, treatments, theories, concepts, hypotheses, principles, models, and statistical procedures. For example:
Correct citation:
Corrigan, F., Fisher, J., & Nutt, D. (2011). Autonomic dysregulation and the window of tolerance model of the effects of complex emotional trauma. Journal of Psychopharmacology, 25(1), 17–25. https://doi.org/10.1177/0269881109354930
Incorrect citation:
Corrigan, F., Fisher, J., & Nutt, D. (2011). Autonomic dysregulation and the Window of Tolerance Model of the effects of complex emotional trauma. Journal of Psychopharmacology, 25(1), 17–25. https://doi.org/10.1177/0269881109354930
Capitalise Personal names that appear in the title:
Sacco, R. (2016). The Fibonacci life‐chart method (FLCM) as a foundation for Carl Jung’s theory of synchronicity. Journal of Analytical Psychology, 61(2), 203–222. https://doi.org/10.1111/1468-5922.12204
More information and examples can be found in the link below:
