To cite systemfit in publications use:
Henningsen A, Hamann JD (2007). “systemfit: A Package for Estimating Systems of Simultaneous Equations in R.” Journal of Statistical Software, 23(4), 1–40. https://www.jstatsoft.org/v23/i04/.
Corresponding BibTeX entry:
@Article{,
title = {systemfit: A Package for Estimating Systems of
Simultaneous Equations in R},
author = {Arne Henningsen and Jeff D. Hamann},
journal = {Journal of Statistical Software},
year = {2007},
volume = {23},
number = {4},
pages = {1--40},
url = {https://www.jstatsoft.org/v23/i04/},
}