To cite package ‘MeSHDbi’ in publications use:

  K Tsuyuzaki, M Gota, M Ishii, T Nakazato, S Miyazaki, I Nikaido
  (2015): MeSH ORA framework: R/Bioconductor packages to support MeSH
  over-representation analysis. BMC Bioinformatics

A BibTeX entry for LaTeX users is

  @Article{,
    title = {MeSH ORA framework: R/Bioconductor packages to support MeSH over-representation analysis},
    author = {Koki Tsuyuzaki and Gota Morota and Manabu Ishii and Takeru Nakazato and Satoru Miyazaki and Itoshi Nikaido},
    year = {2015},
    journal = {BMC Bioinformatics},
    doi = {10.1186/s12859-015-0453-z},
    url = {http://www.biomedcentral.com/1471-2105/16/45},
  }