To cite package ‘SRAdb’ in publications use:

  Zhu Y, Stephens RM, Meltzer PS, Davis SR (2013). “SRAdb: query and
  use public next-generation sequencing data from within R.” _BMC
  bioinformatics_, *14*(1), 19.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {SRAdb: query and use public next-generation sequencing data from within R},
    author = {Yuelin Zhu and Robert M. Stephens and Paul S. Meltzer and Sean R. Davis},
    journal = {BMC bioinformatics},
    volume = {14},
    number = {1},
    pages = {19},
    year = {2013},
    publisher = {BioMed Central Ltd},
  }