Hagen, Y. (1956). The Irruption of hawk-owls (Surnia Ulula (L.)) in Fennoscandia 1950-51: With some remarks on recent micro-rodent cycles. Aktietrykkeriet.
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Dyfyniad Arddull Chicago
Hagen, Yngvar. The Irruption of Hawk-owls (Surnia Ulula (L.)) in Fennoscandia 1950-51: With Some Remarks on Recent Micro-rodent Cycles. Stavanger: Aktietrykkeriet, 1956.
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Dyfyniad MLA
Hagen, Yngvar. The Irruption of Hawk-owls (Surnia Ulula (L.)) in Fennoscandia 1950-51: With Some Remarks on Recent Micro-rodent Cycles. Aktietrykkeriet, 1956.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.