MODISTools is now maintained by Koen Hufkens. It was originally written by Sean Tuck and Helen Phillips.
To cite MODISTools in publications, you can continue to use:
Tuck, S.L., Phillips, H.R.P., Hintzen, R.E., Scharlemann, J.P.W., Purvis, A. and Hudson, L.N. (2014) MODISTools -- downloading and processing MODIS remotely sensed data in R. Ecology and Evolution, 4 (24), 4658--4668. DOI: 10.1002/ece3.1273.
The Oak Ridge National Laboratory Distributed Active Archive Center (ORNL DAAC) has an FAQ here.