Norberg, R., and U. M. Norberg. “Size of Fish Carried by Flying Red-Throated Divers Gavia Stellata (Pont.) to Nearly Fledged Young in Nesting Tarn”. Ornis Fennica, vol. 53, no. 3, Sept. 1976, pp. 92–95, https://ornisfennica.journal.fi/article/view/132906.