Melo, M.; Stervander, M.; Hansson, B.; Jones, P. J. (2017). "The endangered São Tomé Grosbeak Neospiza concolor is the world's largest canary". Ibis. 159 (3): 673–679. doi:10.1111/ibi.12466.
Melo, Martim; Stervander, Martin; Hansson, Bengt; Jones, Peter J. (2017-07-01). "The endangered São Tomé Grosbeak Neospiza concolor is the world's largest canary". Ibis. 159 (3): 673–679. doi:10.1111/ibi.12466. ISSN1474-919X.
Gill, Frank; Donsker, David (eds.). "Finches, euphonias". World Bird List Version 5.2. International Ornithologists' Union. Retrieved 5 June 2015.
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Melo, Martim; Stervander, Martin; Hansson, Bengt; Jones, Peter J. (2017-07-01). "The endangered São Tomé Grosbeak Neospiza concolor is the world's largest canary". Ibis. 159 (3): 673–679. doi:10.1111/ibi.12466. ISSN1474-919X.