I'm not really sure if the guide book is available in Turkey Lorraine, as I got mine on line in the UK, I'm sure if you have a postal address in Turkey you could get it on line, not sure whether you'd get one over the counter.
As I say I'm probably doing about 5 days end of April and can give more info after that, I'll also have GPS files for the sections I walk (also available from the guide once purchased) which I can send you as a GPX file, if you use a GPS device that is. I can also extract information for you from my guide if you wish.
Also another option is that if you live in Turkey and have problems getting a copy I can get another on line here in the UK and bring it out for you end of April.
P.S. I've just noticed from your profile that you appear to be based in France so you should be able to get a copy sent there.