Citazione Stile APA (7a Edizione)

Weir, A., Chappell, J., & Kacelnik, A. (2002). Shaping of hooks in New Caledonian crows.

Citazione stile Chigago Style (17a edizione)

Weir, A., J. Chappell, e A. Kacelnik. Shaping of Hooks in New Caledonian Crows. 2002.

Citatione MLA (9a ed.)

Weir, A., et al. Shaping of Hooks in New Caledonian Crows. 2002.