newsdeskdan said:
Be that as it may, I modified my earlier response to enquire after your knowledge of David Masters. I do not have his (1983, apparently) book. Do you know anything about him as an author? I only ask because internet searches for 'author David Masters' turn up some interesting results.
Library Thing reckons those are not the David Masters you are looking for: https://www.librarything.com/author/mastersdavid
His book is published by Jane's, which ought to lend some credibility, and at the back he does give some clues as to his sources; "The contents of this book have been complied over a number of years from a vast number of major and minor references." He then lists some nine major documents, including books by the likes of Green or Novarra, and miscellaneous stuff such as A.I.2(G) Report No. 2383 to the Air Reserve Gazette. All in all, he does not appear to have been particularly selective - he gives credence to several flying saucer tall tales with no more qualification than the "multiple sources say" variety - so in this respect I treat it as a source book of stories to bear in mind until one can check them out, nothing more. I also find it a very useful quick-finder, having all the projects illustrated and listed by manufacturer.