To cite plink in publications use:
Weeks JP (2010). “plink: An R Package for Linking Mixed-Format Tests Using IRT-Based Methods.” Journal of Statistical Software, 35(12), 1–33. http://www.jstatsoft.org/v35/i12/.
Corresponding BibTeX entry:
@Article{,
title = {{plink}: An {R} Package for Linking Mixed-Format Tests
Using IRT-Based Methods},
author = {Jonathan P. Weeks},
journal = {Journal of Statistical Software},
year = {2010},
volume = {35},
number = {12},
pages = {1--33},
url = {http://www.jstatsoft.org/v35/i12/},
}