To cite items from the Yearbook of Paediatric Endocrinology, please make sure you include the names of the authors, year of publication, abstract title and, most importantly, the fact that it is from the Yearbook of Paediatric Endocrinology, with volume and article number.
For example:
Buckley C D 2017 Fibroblasts and tissue remodelling: Defining a role for fibroblasts in the persistence of chronic inflammation. Yearbook of Paediatric Endocrinology 50 S9