"National Geographic" Field Guide to the Birds of North America ISBN 0-7922-6877-6
Handbook of the Birds of the World Vol 5, Josep del Hoyo editor, ISBN 84-87334-25-3
"National Audubon Society" The Sibley Guide to Birds, by David Allen Sibley, ISBN 0-679-45122-6
Biemiller, L.(2003). Night Vigil. Chronicle of Higher Education, 49 (44),A40.
Linkhart, B. & Reynolds, R (2007). Return rate, fidelity, and dispersal in a breeding population of flammulated owls (Otus flammerlous) The Auk 124 (1):246-275.
Marti, C. Flammulated Wols (Otus flammerlous) breeding in deciduous forests.
Samson, F. B. (2005). A Conservation assessment of the northern goshawk, blacked-backed woodpecker, flammulated owl, and pileated woodpecker in the Northern Region, USDA Forest Service. Unpublished report on file, Northern Region, Missoula, Montana, USA.
