To cite msm in publications use:
Christopher H. Jackson (2011). “Multi-State Models for Panel Data: The msm Package for R.” Journal of Statistical Software, 38(8), 1–29. doi:10.18637/jss.v038.i08.
Corresponding BibTeX entry:
@Article{, title = {Multi-State Models for Panel Data: The {msm} Package for {R}}, author = {{Christopher H. Jackson}}, journal = {Journal of Statistical Software}, year = {2011}, volume = {38}, number = {8}, pages = {1--29}, doi = {10.18637/jss.v038.i08}, }