Actually Scotty they're citing Vol 2. Which is referenced as such:
_______. Flying Combat Aircraft of USAAF-USAF (Vol.2). Andrews AFB, Maryland: Air Force Historical Foundation, 1978. ISBN 0-8138-0375-6.
I assume the ______ is a stand in for the same editors of Vol 1. Being "Higham, Roy and Williams, Carol, eds." Their footnote is wrongly credited then too. Roy might be a nickname, but an ISBN search shows it's actually credited to a Robin Higham. Basically this is borderline plagiarism.
I wouldn't be surprised in the least to actually look up that source and find it cut and pasted. Blatant plagiarism. Given that they don't cite a page number I'd have to look through the whole 202 pages to find this info. Again plagiarism.
Too much crap is either copied onto Wikipedia or just made up because people don't care about where the info comes from. They assume that it'll be credible because its got some type of footnote. This could be a true fact, but its too bad whoever wrote this didn't give proper credit.
If you do want to assert something, check the real source. If you don't want to take the time then don't.