A good way to find relevant literature is to scan the reference list of an article you've found to see if any of the references cited are worth pursuing. It is highly likely a percentage of the references will be relevant to your research.
This only looks at past references, meaning the publication dates are going to be older than the article you are reading. So you can look at the citation count as well, to see if articles published more recently are referring to your article.
You'll find citation counts on Google Scholar, QUT Library Search, Scopus, Web of Science, etc in fact most scholarly databases, usually beneath the result listing or to the right of the listing or article. Web of Science (see the QUT Library Search example), Scopus and SciVal are the most commonly seen citation indexes, so if you can't find "Cited by" or "Citations" mentioned, check for a number near one of those names.
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