Madden, E. M.; Murphy, R. K.; Hansen, A. J.; Murray, L. (2000). "Models for Guiding Management of Prairie Bird Habitat in Northwestern North Dakota". American Midland Naturalist. 144 (2): 377–92. doi:10.1674/0003-0031(2000)144[0377:MFGMOP]2.0.CO;2. S2CID85660244.
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Madden, E. M.; Murphy, R. K.; Hansen, A. J.; Murray, L. (2000). "Models for Guiding Management of Prairie Bird Habitat in Northwestern North Dakota". American Midland Naturalist. 144 (2): 377–92. doi:10.1674/0003-0031(2000)144[0377:MFGMOP]2.0.CO;2. S2CID85660244.