To evaluate competitive advantage as a zone 3a item in the agile literature review approach

To evaluate competitive advantage as a zone 3a item in the agile literature review approach, it is important to do literature search on "how to measure competitive advantage" because the item of "to evaluate the competitive advantage of ABC Ltd" is a zone 3a item [outcomes-related]. In this case, the following references are clearly relevant:

1. Review of Competitive Advantage Measurements: Reference on Agribusiness Sector

2. Developing a measure of competitive advantage

3. How To Measure Competitive Advantage

There are altogether 3 literature search tasks for zone 3a items, but this one on measurement is the prime one.