I am writing a research paper on leadership styles in IT companies in X country. However, I cannot find a western literature on generalization of leadership styles exercised in IT companies, such as software companies for example. I am not interested in Project Management leadership styles as I have people of different titles in my sample. Please let me know if you have any suggestions on particular papers or authors who explored this question? 
What are the common leadership styles in IT companies?
reference request;io psychology;leadership