To cite poLCA in publications use:
Drew A. Linzer, Jeffrey B. Lewis (2011). poLCA: An R Package for Polytomous Variable Latent Class Analysis. Journal of Statistical Software, 42(10), 1-29. URL http://www.jstatsoft.org/v42/i10/.
Corresponding BibTeX entry:
@Article{, title = {{poLCA}: An {R} Package for Polytomous Variable Latent Class Analysis}, author = {Drew A. Linzer and Jeffrey B. Lewis}, journal = {Journal of Statistical Software}, year = {2011}, volume = {42}, number = {10}, pages = {1--29}, url = {http://www.jstatsoft.org/v42/i10/}, }