BibTeX:
@incollection{Various,
  author = {Various},
  title = {The Horse Show},
  booktitle = {Baha'i Stories for Children},
  url = {https://bahaistoriesforchildren.blogspot.com/2015/08/the-horse-show.html},
}

APA:
Various. The Horse Show. In *Baha'i Stories for Children*.

MLA:
Various. "The Horse Show." *Baha'i Stories for Children*, n.d..

Chicago:
Various. "The Horse Show." In *Baha'i Stories for Children*, n.d..