How would I conduct literature review on the main literature of brand purpose, I am just wondering to what extent i need to comment on the source itself or do I just need to conceptualize the main points. This is the rubric for the assignment:

Exemplary in all aspect including the presentation of a comprehensive, integrated and critical analysis of the relevant literature. An in-depth understanding of brand purpose concept, the underlying drivers and motivations in identifying and communicating brand purpose is demonstrated.