1. "Owl Care Manual." (2022)
2. "A Dictionary of Birds." (1985)
3. P. Hendricks and L. M. Hendricks "Journal of Field Ornithology." 66, "Behavior and interaction of Bewick's and House Wrens at a common dusting site, with comments on the utility of dusting." 492 (1995)
4. D. W. Holt, M. D. Larson, N. E. Smith, et al. "Birds of the World." "Snowy Owl (Bubo scandiacus), version 1.0." (2020)
5. A. Holthuijzen, P. Duley, J. Hagar, et al. "Wilson Bulletin." 99, "Bathing behavior of nesting Prairie Falcons (Falco mexicanus) in southwestern Idaho." 135 (1987)