Shuili Du, C.B. Bhattacharya1 and Sankar Sen (2010) Maximizing Business Returns to Corporate Social Responsibility (CSR): The Role of CSR Communication, International Journal of Management Reviews, pp.8-19
You can also consider how the Port Industry reports on CSR activities. Especially whether their rhetorics are consistent with what they actually do or not. e.g. do they use their reporting to legitimise themselves rather than what they actually do?