Ahlgren, C. E., & Ahlgren, I. (2001). Lob trees in the wilderness: The human and natural history of the boundary waters. University of Minnesota Press.
Citace podle Chicago (17th ed.)Ahlgren, C. E., a Isabel Ahlgren. Lob Trees in the Wilderness: The Human and Natural History of the Boundary Waters. Minneapolis, MN: University of Minnesota Press, 2001.
Citace podle MLA (9th ed.)Ahlgren, C. E., a Isabel Ahlgren. Lob Trees in the Wilderness: The Human and Natural History of the Boundary Waters. University of Minnesota Press, 2001.
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