Journal Article
Welty, J. L.; Belthoff, J. R.; Egbert, J.; Schwabl, H.: Relationships between yolk androgens and nest density, laying date, and laying order in Western Burrowing Owls (Athene cunicularia hypugaea). Canadian Journal of Zoology-Revue Canadienne de Zoologie
90 (2), pp. 182 - 192 (2012)