Aha youre acting on the temptation to include a quotable quote in a Wikipedia article Its something that Ive acted on myself for example my quotation from Prutky My suggestion is to repeat Silverbergs own words  but add suppliment his words with the information that specialists in Ethiopian history cant document any actual Ethiopian reaction to this identification Although its a POV as long as its properly attributed to a credible writer AFAIK Silverberg is credible although Pankhurst is more of an authority on Ethiopia then it can be added as one POV  as long as we acknowledge other credible POVs Does this make sense