yes it is hard to find the newer information\publications due to the USA changed over to new diagnostic criteria rendering everything that is presently in print pretty close to no good anymore and no longer what treatment providers go by now.

It may be a few more years or so before you will be able to find the newer stuff in print other than the DSM 5, the new information, standards, tests.... are only 2 years old. if you do a bit of background check on some of your favorite books you presently have you will find it took that author many many years from start to finish and then to push it through publication and get it to the libraries and book stores. who knows if even what you are looking for is going to be in print when it finally hits that point. we now have kindles, computers, notebooks....actual printed on paper books being published are becoming a rare thing. wouldnt surprise me a bit if we are headed towards an era where paper style books in a library does not exist...

my point and suggestion for any updated\new information on DID is to contact your own treatment providers. they will have access to new publications...(articles, testing processes, diagnostic tests.....) they will be able to help you find things that are relevant to your own direct problems and situation.