Ahlgren, C. E., & Ahlgren, I. (2001). Lob trees in the wilderness: The human and natural history of the boundary waters. University of Minnesota Press.
芝加哥风格引文Ahlgren, C. E., 与 Isabel Ahlgren. Lob Trees in the Wilderness: The Human and Natural History of the Boundary Waters. Minneapolis, MN: University of Minnesota Press, 2001.
MLA引文Ahlgren, C. E., 与 Isabel Ahlgren. Lob Trees in the Wilderness: The Human and Natural History of the Boundary Waters. University of Minnesota Press, 2001.
警告：这些引文格式不一定是100％准确.