To cite ggtreeExtra in publications use:

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

S Xu, Z Dai, P Guo, X Fu, S Liu, L Zhou, W Tang, T Feng, M Chen, L Zhan, T Wu, E Hu, Y Jiang, X Bo, G Yu. ggtreeExtra: Compact visualization of richly annotated phylogenetic data. Molecular Biology and Evolution 2021, 38(9):4039-4042.<doi:10.1093/molbev/msab166>

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 = {ggtreeExtra: Compact visualization of richly annotated
      phylogenetic data},
    author = {Shuangbin Xu and Zehan Dai and Pingfan Guo and Xiaocong
      Fu and Shanshan Liu and Lang Zhou and Wenli Tang and Tingze Feng
      and Meijun Chen and Li Zhan and Tianzi Wu and Erqiang Hu and Yong
      Jiang and Xiaochen Bo and Guangchuang Yu},
    journal = {Molecular Biology and Evolution},
    volume = {38},
    issue = {9},
    pages = {4039-4042},
    year = {2021},
    month = {06},
    issn = {0737-4038},
    doi = {10.1093/molbev/msab166},
    pmid = {34097064},
    url =
      {https://academic.oup.com/mbe/advance-article/doi/10.1093/molbev/msab166/6294410},
  }