Dubois, editor of the crisis, published Hughes first poem
Dubois asked Hughes to respond to schyulers essay criticizing negro art
The choice that is common knowledge and could be used in a research paper without crediting the source is, for example, the freezing temperature of water, if that is one of the options.
This is a secondary source as it’s not written by a person who witnessed genetic tech or a geneticist. Also it would be more relevant if this book was a primary source. Hope this helps :))
I had the same question and got it wrong but then I mad corrections and He's an outsider.