A URL that takes me to that specific paper on any web site would be great (typically, this would be a bibliographic site such as CiteULike or the journal). To get the PubMed ID, find your paper on PubMed; the PubMed ID is an 8 digit number that appears in the URL at the end, right after
ncbi.nlm.nih.gov/pubmed/. It also appears just below the abstract, "PMID: [8-digit number]."