Five sources, none of them invented

Starting on a topic and needing somewhere real to begin reading.

Give me the five best sources on the question below. For each: what it is, what it argues, and how much weight it deserves. Only sources you are confident exist. Where you are working from memory rather than certainty, mark that line clearly. I would rather have three real sources than five with one invented.

Question:

Starting on a new topic. Mapping an unfamiliar field, scoping the question, and finding somewhere real to begin reading.