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Gallup. (March 11, 2012). Do you think the U.S. government should approve the building of the Keystone XL pipeline?* [Graph]. In Statista. Retrieved January 21, 2021, from https://www.statista.com/statistics/224522/us-opinions-on-approval-of-keystone-xl-pipeline/
Gallup. "Do you think the U.S. government should approve the building of the Keystone XL pipeline?*." Chart. March 11, 2012. Statista. Accessed January 21, 2021. https://www.statista.com/statistics/224522/us-opinions-on-approval-of-keystone-xl-pipeline/
Gallup. (2012). Do you think the U.S. government should approve the building of the Keystone XL pipeline?*. Statista. Statista Inc.. Accessed: January 21, 2021. https://www.statista.com/statistics/224522/us-opinions-on-approval-of-keystone-xl-pipeline/
Gallup. "Do You Think The U.S. Government Should Approve The Building of The Keystone Xl Pipeline?*." Statista, Statista Inc., 11 Mar 2012, https://www.statista.com/statistics/224522/us-opinions-on-approval-of-keystone-xl-pipeline/
Gallup, Do you think the U.S. government should approve the building of the Keystone XL pipeline?* Statista, https://www.statista.com/statistics/224522/us-opinions-on-approval-of-keystone-xl-pipeline/ (last visited January 21, 2021)