Welt, Cory & Rennack, Dianne E. Overview of U.S. Sanctions Regimes on Russia, report, January 11, 2017; (https://digital.library.unt.edu/ark:/67531/metadc990714/m1/1/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .