Including examples of where to find it: maybe the Serbian Orthodox Church's official website, or online archives like the Digital Library of the Serbian Orthodox Church. Also, checking with institutions like the Patriarchate of Karageorgevica or other Serbian monasteries that might have digitized their liturgical works.
I should also consider that some PDFs might be in PDF/A format for better archiving, but the user just needs standard PDFs. So advising them to use PDF converters if scanning from books is necessary. liturgija sv jovana zlatoustog pdf link
Need to verify if the user wants the actual liturgy's text or the explanation of it. Since it's "liturgija," likely the text. So focusing on how to access the text in Serbian or related languages. Suggest using advanced search terms on Google with "site:..." to target Serbian domains. For example, site:.sr or .org or .edu for Serbian educational institutions. Including examples of where to find it: maybe