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Pike, T.W. (2019). "Quantifying the maculation of avian eggs using eggshell geometry". Ibis. 161 (3): 686–93. doi:10.1111/ibi.12708. S2CID91882725.
Birkhead, Tim R. (1978). "Behavioural adaptations to high density nesting in the Common Guillemot, Uria aalge". Animal Behaviour. 26: 321–331. doi:10.1016/0003-3472(78)90050-7. S2CID53154295.
Birkhead, T.R.; Thompson, J.E.; Biggins, J.D.; Montgomerie, J. (2019). "The evolution of egg shape in birds: selection during the incubation period". Ibis. 161 (3): 605–18. doi:10.1111/ibi.12658. S2CID91893987.