Once a researcher has defined the research problem and established research objectives, the researcher should

Determine the sources of information to fulfill the research objectives.

Explanation:

Research is all about thorough investigation of a problem in order to achieve certain predetermined research objectives.

There are certain steps involved in research. One of the key steps in research is definition of the problem to be investigated in the course of the research.

When that is done, the researcher must then determine whether or not there is sufficient available information regarding the problem that he/she intends to investigate.