Catalogue of the passeriformes or perching birds in the collection of the British
Museum : ciclomorphae : part. 2. containing the family turdidae (warblers and trushes)
/ by Henry Seebohm, 1881
Internet, authorities.loc.gov.2009-07-07
The birds of Siberia : a record of a naturalist's visits to the Valleys of the Petchora
and Yenesei / Henry Seebohm, 2011