I've been in your shoes before, trying to access documents on Studylib without paying, and I found that sometimes you can find the same documents on other platforms like Academia.edu or ResearchGate, where authors often share their work for free. You can also try searching for the document title along with the author's name on a search engine, as some universities or institutions may have made them available online. If not, you might want to look into online libraries like DOAJ or arXiv, they offer a wide range of academic papers and articles for free, although the selection might be limited compared to Studylib.