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Sork, V. L. 1983. Mast-fruiting in hickories and availability of nuts. Am. Midl. Nat. 109:81-88.

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Armitage, K. B., and K. S. Harris. 1982. Spatial patterning in sympatric populations of fox and gray squirrels. American Midland Naturalist 108:389-97.

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Goodrum, P. D., V. H. Reid, and C. E. Boyd. 1971. Acorn yields, characteristics, and management criteria of oaks for wildlife. Journal of Wildlife Management 35:520-32.

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Hibbard, E. A. 1956. Range and spread of the gray and the fox squirrels in North Dakota. Journal of Mammalogy 37:525-31.

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Maki, T. E. 1952. Local longleaf pine seed years. J. For. 50:321-2.

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