To cite MCMCglmm in publications use:

Hadfield JD (2010). “MCMC Methods for Multi-Response Generalized Linear Mixed Models: The MCMCglmm R Package.” Journal of Statistical Software, 33(2), 1–22. https://www.jstatsoft.org/v33/i02/.

Corresponding BibTeX entry:

  @Article{,
    title = {MCMC Methods for Multi-Response Generalized Linear Mixed
      Models: The {MCMCglmm} {R} Package},
    author = {Jarrod D. Hadfield},
    journal = {Journal of Statistical Software},
    year = {2010},
    volume = {33},
    number = {2},
    pages = {1--22},
    url = {https://www.jstatsoft.org/v33/i02/},
  }