Mary Caswell Stoddard, Ee Hou Yong, Derya Akkaynak, Catherine Sheard, Joseph A. Tobias and L. Mahadevan (2017) "Avian egg shape: Form, function, and evolution", Science 356 (6344), 1249–54. doi:10.1126/science.aaj1945
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.
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.