NCI Cancer Research Data Commons (CRDC) should be cited with the URL "datacommons.cancer.gov" and the following paper:
Izumi V. Hinkson, Tanja M. Davidsen, Juli D. Klemm, Ishwar Chandramouliswaran, Anthony R. Kerlavage, Warren A. Kibbe. “A Comprehensive Infrastructure for Big Data in Cancer Research: Accelerating Cancer Research and Precision Medicine.” Front Cell Dev Biol. 2017; 5: 83. Published 2017 Sep 21. doi: 10.3389/fcell.2017.00083
When citing individual data commons or CRDC cloud resources, please refer to the attribution policies of those CRDC components, available on their microsites and portals.