If you're in no hurry to go to the scholarly articles page, check out this lecture (2011) by Giacomo Rizzolatti.

For lists of about a thousand peer reviewed, scholarly Journal articles on mirror neurons, go to mirror_neuron_articles: 951 citations from pubmed.gov. (Today, 8-26-16, there are over 1,340 results at PubMed, to a search for ["mirror neuron" OR "mirror neurons"]. (Both are necessary; oddly, the second (plural) expression is not included in many results for the first (singular) expression.)