To cite phylogram in publications use:

Wilkinson SP (2017) The 'phylogram' package for developing evolutionary trees with R. R package version 1.0.0. https://cran.r-project.org/package=phylogram

Corresponding BibTeX entry:

  @Manual{,
    title = {The {phylogram} package for developing evolutionary trees
      with R},
    author = {Shaun Wilkinson},
    url = {https://cran.r-project.org/package=phylogram},
    year = {2017},
  }