Weir, A., Chappell, J., & Kacelnik, A. (2002). Shaping of hooks in New Caledonian crows.
Lua i Stíl Chicago (17ú heag.)Weir, A., J. Chappell, agus A. Kacelnik. Shaping of Hooks in New Caledonian Crows. 2002.
Lua MLA (9ú heag.)Weir, A., et al. Shaping of Hooks in New Caledonian Crows. 2002.
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