In an effort to move my work to a single place, I’m going to link my translations from English to Polish performed for the Gentoo distribution. The author of the original text is Daniel Robbins. I find these documents well written and helpful when learning thread management not only if you want to use them in your software, but also learn how the OS is managing the threads (IT Operations, troubleshooting issues, improving system performance, debugging).
Original work (now hosted on IBM website).
My translations: POSIX Threads part 1, part 2 and part 3.