To cite Bergm in publications use:
Alberto Caimo, Nial Friel (2014). Bergm: Bayesian Exponential Random Graphs in R. Journal of Statistical Software, 61(2), 1-25. URL http://www.jstatsoft.org/v61/i02/.
Corresponding BibTeX entry:
@Article{, title = {{Bergm}: {B}ayesian Exponential Random Graphs in {R}}, author = {Alberto Caimo and Nial Friel}, journal = {Journal of Statistical Software}, year = {2014}, volume = {61}, number = {2}, pages = {1--25}, url = {http://www.jstatsoft.org/v61/i02/}, }