Beobachtungen am SpechtfinkenCactospiza pallida (Sclater und Salvin)
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Tài liệu tham khảo
Bowman, R. I. (1961): Morphological differentiation and adaptation in the Galapagos Finches; Univ. of Calif. Publ. in Zool.58 326.
Eibl-Eibesfeldt, I. (1961): Über den Werkzeuggebrauch des SpechtfinkenCamarhynchus pallidus; Z. Tierpsychol.18 343–346.
Gifford, E. W. (1919): Field notes on land birds of the Galapagos Islands and Cocos Island; Proc. Calif. Acad. Sci. (4)2 189–258.
Lack, D. (1947): Darwin's Finches. Cambridge 1947.