To cite treeio in publications use:

Guangchuang Yu. (2022). Data Integration, Manipulation and Visualization of Phylogenetic Trees (1st edition). Chapman and Hall/CRC.

LG Wang, TTY Lam, S Xu, Z Dai, L Zhou, T Feng, P Guo, CW Dunn, BR Jones, T Bradley, H Zhu, Y Guan, Y Jiang, G Yu. treeio: an R package for phylogenetic tree input and output with richly annotated and associated data. Molecular Biology and Evolution 2020, 37(2):599-603.<doi:10.1093/molbev/msz240>

Corresponding BibTeX entries:

  @Book{,
    title = {Data Integration, Manipulation and Visualization of
      Phylogenetic Treess},
    author = {Guangchuang Yu},
    publisher = {Chapman and Hall/{CRC}},
    year = {2022},
    edition = {1st edition},
    url =
      {https://www.amazon.com/Integration-Manipulation-Visualization-Phylogenetic-Computational-ebook/dp/B0B5NLZR1Z/},
  }

  @Article{,
    title = {treeio: an R package for phylogenetic tree input and
      output with richly annotated and associated data.},
    author = {Li-Gen Wang and Tommy Tsan-Yuk Lam and Shuangbin Xu and
      Zehan Dai and Lang Zhou and Tingze Feng and Pingfan Guo and Casey
      W. Dunn and Bradley R. Jones and Tyler Bradley and Huachen Zhu
      and Yi Guan and Yong Jiang and Guangchuang Yu},
    year = {2020},
    journal = {Molecular Biology and Evolution},
    volume = {37},
    issue = {2},
    pages = {599-603},
    doi = {10.1093/molbev/msz240},
  }