To cite TreeBUGS in publications use:

Heck, D. W., Arnold, N. R., & Arnold, D. (2018). TreeBUGS: An R package for hierarchical multinomial-processing-tree modeling. Behavior Research Methods, 50. 264-284.<doi:10.3758/s13428-017-0869-7>

Corresponding BibTeX entry:

  @Article{,
    title = {TreeBUGS: An R package for hierarchical
      multinomial-processing-tree modeling},
    author = {Daniel W. Heck and Nina R. Arnold and Denis Arnold},
    journal = {Behavior Research Methods},
    year = {2018},
    volume = {50},
    pages = {264-284},
    doi = {10.3758/s13428-017-0869-7},
    url = {https://github.com/danheck/TreeBUGS},
  }