Bradshaw, Elizabeth A. (August 30, 2015). "Blockadia Rising: Rowdy Greens, Direct Action and the Keystone XL Pipeline". Critical Criminology. 23 (4): 433–448. doi:10.1007/s10612-015-9289-0. ISSN1205-8629. S2CID143262305.
De Souza, Mike. (April 10, 2016). "TransCanada restarts Keystone pipeline after repairing leak". National Observer website Retrieved November 18, 2017.
Bradshaw, Elizabeth A. (August 30, 2015). "Blockadia Rising: Rowdy Greens, Direct Action and the Keystone XL Pipeline". Critical Criminology. 23 (4): 433–448. doi:10.1007/s10612-015-9289-0. ISSN1205-8629. S2CID143262305.
Department Of State. The Office of Electronic Information, Bureau of Public Affairs (March 14, 2008), Keystone Pipeline Presidential Permit, retrieved April 1, 2020
Bradshaw, Elizabeth A. (August 30, 2015). "Blockadia Rising: Rowdy Greens, Direct Action and the Keystone XL Pipeline". Critical Criminology. 23 (4): 433–448. doi:10.1007/s10612-015-9289-0. ISSN1205-8629. S2CID143262305.