Without naming or citing the source, the WTS retains control of the information. It's usually because quotes are taken out of context or the meaning altered entirely with the use of ellipses ( ... ). Fact checking becomes extremely difficult, though in the realm of the internet it is not impossible. But it was darn near impossible in the 60s and 70s when my family was being indoctrinated.
I believe it was AlanF who did an exposé of the Creation book, by looking up all the citations and references it contained and found that the vast majority of sources were quoted out of context and had their meanings altered by the careful manipulation of quotations.
Here's AlanF's thread regarding the Trinity brochure: http://www.jehovahs-witness.net/jw/friends/3174/1/Confirming-WTS-Scholastic-Dishonesty
I've also checked some sources and in the past and found precisely the same kind of academic dishonesty in the WTS's writing.