If you use in your research the implementations provided by the MNE software you should cite:
[1] A. Gramfort, M. Luessi, E. Larson, D. Engemann, D. Strohmeier, C. Brodbeck, L. Parkkonen, M. Hämäläinen, MNE software for processing MEG and EEG data, NeuroImage, Volume 86, 1 February 2014, Pages 446-460, ISSN 1053-8119, [DOI]
If you use the Python code you should cite as well:
[2] A. Gramfort, M. Luessi, E. Larson, D. Engemann, D. Strohmeier, C. Brodbeck, R. Goj, M. Jas, T. Brooks, L. Parkkonen, M. Hämäläinen, MEG and EEG data analysis with MNE-Python, Frontiers in Neuroscience, Volume 7, 2013, ISSN 1662-453X, [DOI]
To cite specific versions of the software, you can use the DOIs provided by Zenodo.
You should as well cite the related method papers, some of which are listed in :ref:`ch_reading`.