To cite reshape2 in publications use:
Wickham H (2007). “Reshaping Data with the reshape Package.” Journal of Statistical Software, 21(12), 1–20. http://www.jstatsoft.org/v21/i12/.
Corresponding BibTeX entry:
@Article{,
title = {Reshaping Data with the {reshape} Package},
author = {Hadley Wickham},
journal = {Journal of Statistical Software},
year = {2007},
volume = {21},
number = {12},
pages = {1--20},
url = {http://www.jstatsoft.org/v21/i12/},
}