How do legal encyclopedias direct researchers to primary authorities?

How do legal encyclopedias direct researchers to primary authorities?

Wyatt is researching the requirements for obtaining a patent. He has no familiarity with this area of law. Where might Wyatt begin his research efforts to gain some background information on patent law? Why?

Using Am. Jur. 2d., answer the following question:

a) Which title and section deal with building regulations for sprinkler systems?