I am trying to figure out the appropriate way to cite a British manual (in this case it's for the Archer, aka SP Valentine, no surprise there). The title and date are obvious, on the front cover. But then as far as publisher is concerned, I'm a little unclear what to state. The end of the manual mentions "R&W Ltd" of Chertsey and that seems to be an engineering firm, and I don't know what their role would have been. Any thoughts?