To cite exprso in publications use:

Quinn T, Tylee D and Glatt S. 2016. exprso: an R-package for the rapid implementation of machine learning algorithms. F1000Research, 5:2588. URL http://f1000research.com/articles/5-2588/.

Corresponding BibTeX entry:

  @Article{,
    title = {exprso: an R-package for the rapid implementation of
      machine learning algorithms},
    author = {Thomas Quinn and Daniel Tylee and Stephen Glatt},
    journal = {F1000Research},
    year = {2016},
    volume = {5},
    number = {2588},
    url = {http://f1000research.com/articles/5-2588/},
  }