1. You create a standard BibTeX file (referenced in the YAML metadata via bibliography: mybibfile.bib). In R Markdown you refer to an entry with the @ symbol followed immediately by the BibTeX entry name;References are supported via BibTeX
2. Note that you don't want numbering on the references section header, hence the addition of a minus sign inside braces at the end of the Reference header appearing at the end of this Markdown script;Wohar Gupta;Apergis and Apergis,2017