To cite lsmeans in publications use:
Lenth RV (2016). “Least-Squares Means: The R Package lsmeans.” Journal of Statistical Software, 69(1), 1–33. doi:10.18637/jss.v069.i01.
Corresponding BibTeX entry:
@Article{, title = {Least-Squares Means: The {R} Package {lsmeans}}, author = {Russell V. Lenth}, journal = {Journal of Statistical Software}, year = {2016}, volume = {69}, number = {1}, pages = {1--33}, doi = {10.18637/jss.v069.i01}, }