BibTeX:
@incollection{Various,
  author = {Various},
  title = {‘Abdu’l-Baha’s meeting with children in Esslingen, Germany, April 4th, 1913},
  booktitle = {Baha'i Stories for Children},
  url = {https://bahaistoriesforchildren.blogspot.com/2023/09/abdul-bahas-meeting-with-children-in.html},
}

APA:
Various. ‘Abdu’l-Baha’s meeting with children in Esslingen, Germany, April 4th, 1913. In *Baha'i Stories for Children*.

MLA:
Various. "‘Abdu’l-Baha’s meeting with children in Esslingen, Germany, April 4th, 1913." *Baha'i Stories for Children*, n.d..

Chicago:
Various. "‘Abdu’l-Baha’s meeting with children in Esslingen, Germany, April 4th, 1913." In *Baha'i Stories for Children*, n.d..