To cite the package 'primer' in publications use:
Stevens MHH (2009). A Primer of Ecology with R, 2nd printing. Springer, New York.
Corresponding BibTeX entry:
@Book{, title = {A Primer of Ecology with R, 2nd printing}, author = {M. H. H. Stevens}, publisher = {Springer}, address = {New York}, year = {2009}, }