Byrkjedal, I., G. B. Grønstøl, J. E. Hafsmo, and T. Lislevand. “Chick Punishment and Chick Adoption in Northern Lapwings”. Ornis Fennica, vol. 77, no. 2, July 2000, pp. 89–92, https://ornisfennica.journal.fi/article/view/133531.