To cite package MCMCglmm in publications use:

Hadfield J.D. (2009) MCMC methods for Multi-response Generalised Linear Mixed Models: The MCMCglmm R Package

Corresponding BibTeX entry:

  @Article{,
    title = {MCMC methods for Multi-response Generalised Linear Mixed
      Models: The MCMCglmm R Package},
    author = {J.D. Hadfield},
    language = {English},
    year = {2009},
    journal = {submitted},
    volume = {1},
    number = {1},
    pages = {1},
    month = {1},
  }