Weir, A., Chappell, J., & Kacelnik, A. (2002). Shaping of hooks in New Caledonian crows.
芝加哥风格引文Weir, A., J. Chappell, 与 A. Kacelnik. Shaping of Hooks in New Caledonian Crows. 2002.
MLA引文Weir, A., et al. Shaping of Hooks in New Caledonian Crows. 2002.
警告：这些引文格式不一定是100％准确.