Reference for Gromacs-CP2K interface

I have used gmx_CP2K interface to run QM/MM TD-DFT calculation. Now, I would like to cite the tools in my research article.

Could someone provide me with the info about how to cite it?

Thanking you,
Ranabir Majumder
Senior Research Fellow
Indian Institute of Technology Kharagpur

For now you could cite GROMACS and CP2K.