BibTeX:
@incollection{Various,
  author = {Various},
  title = {An example of ‘Abdu’l-Baha’s very generous nature when He was seven years old},
  booktitle = {Baha'i Stories for Children},
  url = {https://bahaistoriesforchildren.blogspot.com/2015/04/an-example-of-abdul-bahas-very-generous.html},
}

APA:
Various. An example of ‘Abdu’l-Baha’s very generous nature when He was seven years old. In *Baha'i Stories for Children*.

MLA:
Various. "An example of ‘Abdu’l-Baha’s very generous nature when He was seven years old." *Baha'i Stories for Children*, n.d..

Chicago:
Various. "An example of ‘Abdu’l-Baha’s very generous nature when He was seven years old." In *Baha'i Stories for Children*, n.d..