National Research Council (U. S.) Study Committee on the Potential for Rehabilitating Lands Surface Mined for Coal in the Western United States (14 de Junho de 1974). Rehabilitation potential of western coal lands. Cambridge, MA: Ford Foundation Energy Policy Project / Ballinger Pub. Co. pp. 85–86. ISBN978-0-88410-331-8. Consultado em 5 de dezembro de 2022
"Lamm explained his view that Colorado must begin to control its own future, rather than succumbing to Washington's plea that the state should be "a national sacrifice area" to provide for the nation's energy needs." Griffith, Winthrop (27 de outubro de 1974). «An eco‐freak for governor?». The New York Times. ISSN0362-4331. Consultado em 10 de maio de 2017
Huntington Smith, Helena (16 de fevereiro de 1975). «The Wringing of the West». The Washington Post. Washington, DC. p. 1–B4. ISSN0190-8286. ProQuest146405625
Huntington Smith, Helena (16 de fevereiro de 1975). «The Wringing of the West». The Washington Post. Washington, DC. p. 1–B4. ISSN0190-8286. ProQuest146405625
"Lamm explained his view that Colorado must begin to control its own future, rather than succumbing to Washington's plea that the state should be "a national sacrifice area" to provide for the nation's energy needs." Griffith, Winthrop (27 de outubro de 1974). «An eco‐freak for governor?». The New York Times. ISSN0362-4331. Consultado em 10 de maio de 2017