Recently, my question Looking for books on the C and POSIX standards was closed as "off topic". I don't really agree with that, and feel misunderstood. Reading the FAQ didn't make it clear either.
Can someone clarify? =/
I think users misunderstood your question and thought you were asking for a book list about the subject.
Questions that ask for broad recommendations like that are typically considered Not Constructive for Stack Exchange because it results in a huge list of books on the subject, voted/sorted according to popularity, and that rapidly gets outdated over time.
I've made an edit to your question to try and clarify that you are looking for the standard documentation for C and POSIX standards so you can reference them in your master thesis, and you are not looking for a huge list of books or other resources to learn from.
I've voted to reopen the question, however it still needs 4 more reopen votes from other community members (or 1 moderator vote).
I understand that the OP wasn't looking for a book recommendation, but the question was and still remained
Where can I get printed versions of these documents?
I voted (twice) to close for a couple of reasons:
Wrong Audience. The question is about the publishing habits of specific standards bodies. The venue to get a good answer would be the standards bodies themselves. I put this in the same category as "Why did Apple reject my iPhone application?"
Overbroad Scope. The major standards bodies develop standards that cover more things than just programming.