Grenqvist, P. (1936) ”Some Diving Notes on Young Tufted Ducks, Young Velvet Scoters and Young Eider Ducks”, Ornis Fennica, 13(1), s. 6–23. Tillgänglig vid: https://ornisfennica.journal.fi/article/view/132337 (åtkomstdatum: 18maj2024).