To cite glmmTMB in publications use:

Brooks ME, Kristensen K, van Benthem KJ, Magnusson A, Berg CW, Nielsen A, Skaug HJ, Maechler M, Bolker BM (2017). “glmmTMB Balances Speed and Flexibility Among Packages for Zero-inflated Generalized Linear Mixed Modeling.” The R Journal, 9(2), 378–400. https://journal.r-project.org/archive/2017/RJ-2017-066/index.html.

Corresponding BibTeX entry:

  @Article{,
    author = {Mollie E. Brooks and Kasper Kristensen and Koen J. {van
      Benthem} and Arni Magnusson and Casper W. Berg and Anders Nielsen
      and Hans J. Skaug and Martin Maechler and Benjamin M. Bolker},
    title = {{glmmTMB} Balances Speed and Flexibility Among Packages
      for Zero-inflated Generalized Linear Mixed Modeling},
    year = {2017},
    journal = {The R Journal},
    url =
      {https://journal.r-project.org/archive/2017/RJ-2017-066/index.html},
    pages = {378--400},
    volume = {9},
    number = {2},
  }