APA-čujuhus (7. p.)
Olson, S. F., & Backes, D. (2001). The meaning of wilderness: Essential articles and speeches. University of Minnesota Press.
Chicago-čujuhus (17. p.)
Olson, Sigurd F., juo David Backes. The Meaning of Wilderness: Essential Articles and Speeches. Minneapolis: University of Minnesota Press, 2001.
MLA-čujuhus (9. p.)
Olson, Sigurd F., juo David Backes. The Meaning of Wilderness: Essential Articles and Speeches. University of Minnesota Press, 2001.
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