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govinfo.gov
Shull, Alisa M. (3 June 1987). "Endangered and Threatened Wildlife and Plants; Determination of Endangered Status for the Mount Graham Red Squirrel". Federal Register. 52 (106): 20994–20999. 52 FR20994
Shull, Alisa M. (21 May 1986). "Endangered and Threatened Wildlife and Plants; Proposed Determination of Endangered Status and Critical Habitat for the Mount Graham Red Squirrel". Federal Register. 51 (98): 18630–18634. 51 FR18630