What leadership styles are most effective in quality healthcare settings?

I have to use these 4 sources, https://doi.org/10.29322/ijsrp.9.09.2019.p9308 , https://doi.org/10.3390/healthcare5040073 , https://doi.org/10.1111/ijmr.12082 ,  https://doi.org/10.1108/LHS-06-2016-0026

I already found the best one- Transactional Leadership Style but I need to write an essay on all of it