Sabine, Tebbich; Irmgard, Teschke; Erica, Cartmill; Sophia, Stankewitz (2012-02-01). "Use of a barbed tool by an adult and a juvenile woodpecker finch (Cactospiza pallida)". Behavioural Processes. Comparative cognition: Function and mechanism in lab and field. 89 (2): 166–171. doi:10.1016/j.beproc.2011.10.016. ISSN0376-6357. PMID22085790. S2CID20819852.
Sabine, Tebbich; Irmgard, Teschke; Erica, Cartmill; Sophia, Stankewitz (2012-02-01). "Use of a barbed tool by an adult and a juvenile woodpecker finch (Cactospiza pallida)". Behavioural Processes. Comparative cognition: Function and mechanism in lab and field. 89 (2): 166–171. doi:10.1016/j.beproc.2011.10.016. ISSN0376-6357. PMID22085790. S2CID20819852.
Sabine, Tebbich; Irmgard, Teschke; Erica, Cartmill; Sophia, Stankewitz (2012-02-01). "Use of a barbed tool by an adult and a juvenile woodpecker finch (Cactospiza pallida)". Behavioural Processes. Comparative cognition: Function and mechanism in lab and field. 89 (2): 166–171. doi:10.1016/j.beproc.2011.10.016. ISSN0376-6357. PMID22085790. S2CID20819852.
Sabine, Tebbich; Irmgard, Teschke; Erica, Cartmill; Sophia, Stankewitz (2012-02-01). "Use of a barbed tool by an adult and a juvenile woodpecker finch (Cactospiza pallida)". Behavioural Processes. Comparative cognition: Function and mechanism in lab and field. 89 (2): 166–171. doi:10.1016/j.beproc.2011.10.016. ISSN0376-6357. PMID22085790. S2CID20819852.