Krautwald Junghanns, ME; Cramer, K; Fischer, B; Förster, A; Galli, R; Kremer, F; Mapesa, EU; Meissner, S et al. (1 March 2018). "Current approaches to avoid the culling of day-old male chicks in the layer industry, with special reference to spectroscopic methods.". Poultry Science97 (3): 749–757. doi:10.3382/ps/pex389. பப்மெட்:29294120.
Krautwald Junghanns, ME; Cramer, K; Fischer, B; Förster, A; Galli, R; Kremer, F; Mapesa, EU; Meissner, S et al. (1 March 2018). "Current approaches to avoid the culling of day-old male chicks in the layer industry, with special reference to spectroscopic methods.". Poultry Science97 (3): 749–757. doi:10.3382/ps/pex389. பப்மெட்:29294120.