Playwright Ian Allen’s Op-Ed in the New York Times from July, 2018, titled Inside the World of Racist Science Fiction.
The books act as a kind of binding agent, a Bible-like codification of basic principles that underpin the various denominations. And yet, for understandable reasons, they remain largely unknown. Journalists are inclined to avoid name-checking the books publicly, for fear of inadvertently promoting them. This is no longer a winning strategy.
Also check out:
Black science fiction writers face 'universal' racism, study finds. via The Guardian (2015)
Derwin Mak’s The Perpetual Foreigner Syndrome in Chinese North American Science Fiction and Fantasy for The New York Review of Science Fiction.