Please acknowledge your use of Quartet and cite the tqDist algorithm.
For example, 'Quartet divergence (Smith 2019a) was calculated using the
tqDist algorithm (Sand et al. 2014) implemented in the R package
Quartet v 1.2.7 (Smith 2019b).

  Smith, MR (2019a). Quartet: comparison of phylogenetic trees using
  quartet and split measures. R package version 1.2.7.
  doi:10.5281/zenodo.2536318

A BibTeX entry for LaTeX users is

  @Manual{Quartet,
    title = {Quartet: comparison of phylogenetic trees using quartet and split measures},
    author = {Martin R. Smith},
    note = {R package version 1.2.7},
    year = {2019},
    doi = {10.5281/zenodo.2536318},
  }

  Sand et al. (2014). tqDist: a library for computing the quartet and
  triplet distances between binary or general trees. Bioinformatics
  30(14): 2079-2080. doi:10.1093/bioinformatics/btu157

A BibTeX entry for LaTeX users is

  @Article{Sand2014,
    author = {Andreas Sand and Morten K. Holt and Jens Johansen and Gerth S. Brodal and Thomas Mailund and Christian N. S. Pedersen},
    doi = {10.1093/bioinformatics/btu157},
    journal = {Bioinformatics},
    number = {14},
    pages = {2079--2080},
    title = {tqDist: a library for computing the quartet and triplet distances between binary or general trees},
    volume = {30},
    year = {2014},
  }

  Smith, MR (2019b). Bayesian and parsimony approaches reconstruct
  informative trees from simulated morphological datasets. Biology
  Letters 15:20180632. doi:10.1098/rsbl.2018.0632

A BibTeX entry for LaTeX users is

  @Article{Smith2019,
    author = {Martin R. Smith},
    doi = {10.1098/rsbl.2018.0632},
    journal = {Biology Letters},
    title = {Bayesian and parsimony approaches reconstruct informative trees from simulated morphological datasets},
    volume = {15},
    number = {2},
    pages = {20180632},
    year = {2019},
  }