May I suggest you refer to my working paper. In the paper, we look at the relationship between corporate governance and financial performance, and did a multiple regression analysis. There, we attempt to quantify corporate governance in several measures.
Research: Corporate Governance and Financial Performance: Empirical Evidence from Public Listed Construction Companies in Malaysia
If you are looking for an analysis of international corporate governance best practice, please feel free to refer to my research paper: "Case Study: Analysis of Corporate Governance and Management Control at Kendallville Bank": https://www.researchgate.net/publication/306515523_Case_Study_Analysis_of_Corporate_Governance_and_Management_Control_at_Kendallville_Bank
It was published in the International Journal of Applied Economic Studies Vol. 4, Issue 3, pp. 14-20 and thus can be used for referencing.
Paul
Article Case Study: Analysis of Corporate Governance and Management ...