Guthrie, A. B., Jr., & Petersen, D. (1988). Big sky, fair land: The environmental essays of A.B. Guthrie, Jr. Northland Press.
Cita Chicago Style (17a ed.)Guthrie, A. B., Jr., y David Petersen. Big Sky, Fair Land: The Environmental Essays of A.B. Guthrie, Jr. [Flagstaff, Ariz.]: Northland Press, 1988.
Cita MLA (8a ed.)Guthrie, A. B., Jr., y David Petersen. Big Sky, Fair Land: The Environmental Essays of A.B. Guthrie, Jr. Northland Press, 1988.
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