To cite package ‘secuTrialR’ in publications use:

  Wright et al., (2020). secuTrialR: Seamless interaction with clinical
  trial databases in R. Journal of Open Source Software, 5(55), 2816,
  https://doi.org/10.21105/joss.02816

A BibTeX entry for LaTeX users is

  @Article{,
    title = {secuTrialR: Seamless interaction with clinical trial databases in R},
    author = {Patrick R. Wright and Alan G. Haynes and Milica Markovic},
    year = {2020},
    journal = {Journal of Open Source Software},
    volume = {5},
    number = {55},
    pages = {2816},
    doi = {10.21105/joss.02816},
  }