To cite package 'geomorph' in a publication use:

Adams, D.C., and E. Otarola-Castillo. 2013. geomorph: an R package for the collection and analysis of geometric morphometric shape data. Methods in Ecology and Evolution. 4:393-399.

As geomorph is evolving quickly, you may want to cite also its version number (found with 'library(help = geomorph)').

Corresponding BibTeX entry:

  @Article{,
    title = {geomorph: an R package for the collection and analysis of
      geometric morphometric shape data},
    author = {D.C. Adams and E. Otarola-Castillo},
    journal = {Methods in Ecology and Evolution},
    year = {2013},
    volume = {4},
    pages = {393-399},
  }