Veistola, S., Lehikoinen, E. och Eeva, T. (1997) ”Foraging niches of two passerines at their subarctic limit of distribution: the Siberian Tit Parus cinctus and the Pied Flycatcher Ficedula hypoleuca”, Ornis Fennica, 74(2), s. 79–87. Tillgänglig vid: https://ornisfennica.journal.fi/article/view/133460 (åtkomstdatum: 19maj2024).