William Senior's survey ... 1988: t.p. (G.R. Potter)
LC data base 07-23-91 (hdg.: Potter, George Richard, 1900- ; usage: G.R. Potter, George R. Potter)
Wikipedia 4 October 2020: (George Richard Potter (1900 – 1981) was a British historian. From 1931 until 1965 he was Professor of Modern/Medieval History at the University of Sheffield.) https://en.wikipedia.org/wiki/George_Richard_Potter