REYNOLDS, Peter; GORMAN, Martyn L. The timing of hunting in short-eared owls (Asio flammeus) in relation to the activity patterns of Orkney voles (Microtus arvalis orcadensis). Journal of Zoology. 1999-03, roč. 247, čís. 3, s. 371–379. Dostupné online [cit. 2020-03-12]. ISSN0952-8369. DOI10.1111/j.1469-7998.1999.tb01000.x. (anglicky)
iucnredlist.org
apiv3.iucnredlist.org
The IUCN Red List of Threatened Species 2021.3. 9. prosince 2021. Dostupné online. [cit. 2021-12-27].
REYNOLDS, Peter; GORMAN, Martyn L. The timing of hunting in short-eared owls (Asio flammeus) in relation to the activity patterns of Orkney voles (Microtus arvalis orcadensis). Journal of Zoology. 1999-03, roč. 247, čís. 3, s. 371–379. Dostupné online [cit. 2020-03-12]. ISSN0952-8369. DOI10.1111/j.1469-7998.1999.tb01000.x. (anglicky)
worldcat.org
REYNOLDS, Peter; GORMAN, Martyn L. The timing of hunting in short-eared owls (Asio flammeus) in relation to the activity patterns of Orkney voles (Microtus arvalis orcadensis). Journal of Zoology. 1999-03, roč. 247, čís. 3, s. 371–379. Dostupné online [cit. 2020-03-12]. ISSN0952-8369. DOI10.1111/j.1469-7998.1999.tb01000.x. (anglicky)