Oficialdegui, Francisco J.; Serrano, David (2024). "Variability of a consistent trait: The size of the white wing patch in European Stonechats (Saxicola rubicola rubicola)". Ibis. 166 (1): 187–199. doi:10.1111/ibi.13252. hdl:10261/330762.
Oficialdegui, Francisco J.; Serrano, David (2024). "Variability of a consistent trait: The size of the white wing patch in European Stonechats (Saxicola rubicola rubicola)". Ibis. 166 (1): 187–199. doi:10.1111/ibi.13252. hdl:10261/330762.