Northcote, E. M. (1981). „Size difference between limb bones of recent and subfossil Mute Swans (Cygnus olor)”. J. Archaeol. Sci. 8 (1): 89—98. doi:10.1016/0305-4403(81)90014-5.
Scott, D. K. (1980). „Functional aspects of the pair bond in winter in Bewick's swans (Cygnus columbianus bewickii)”. Behavioral Ecology and Sociobiology. 7 (4): 323—327. S2CID32804332. doi:10.1007/BF00300673.
Wood, Kevin A.; Ham, Phoebe; Scales, Jake; Wyeth, Eleanor; Rose, Paul E. (7. 8. 2020). „Aggressive behavioural interactions between swans (Cygnus spp.) and other waterbirds during winter: a webcam-based study”. Avian Research. 11 (1): 30. ISSN2053-7166. doi:10.1186/s40657-020-00216-7.CS1 одржавање: Формат датума (веза)
Schlatter, Roberto; Navarro, Rene A.; Corti, Paulo (2002). „Effects of El Nino Southern Oscillation on Numbers of Black-Necked Swans at Rio Cruces Sanctuary, Chile”. Waterbirds. 25 (Special Publication 1): 114—122. JSTOR1522341.
Scott, D. K. (1980). „Functional aspects of the pair bond in winter in Bewick's swans (Cygnus columbianus bewickii)”. Behavioral Ecology and Sociobiology. 7 (4): 323—327. S2CID32804332. doi:10.1007/BF00300673.
Wood, Kevin A.; Ham, Phoebe; Scales, Jake; Wyeth, Eleanor; Rose, Paul E. (7. 8. 2020). „Aggressive behavioural interactions between swans (Cygnus spp.) and other waterbirds during winter: a webcam-based study”. Avian Research. 11 (1): 30. ISSN2053-7166. doi:10.1186/s40657-020-00216-7.CS1 одржавање: Формат датума (веза)