Heraldo V. Norambuena; Andrés Muñoz-Pedreros (September 2012). "Diurnal Activity of the Austral Pygmy Owl (Glaucidium nana) in Southern Chile". The Wilson Journal of Ornithology. 124 (3): 633–635. doi:10.1676/11-118.1.
Pačenovský, Samuel; Shurulinkov, Peter (January 2008). "Latest data on distribution of the Pygmy Owl (Glaucidium passerinum) in Bulgaria and Slovakia including population density comparison". Raptor Journal (dalam bahasa Inggris). 2 (2008): 91–106. doi:10.2478/v10262-012-0023-5.