BibTeX:
@incollection{Various,
  author = {Various},
  title = {Flowers for the Ancient King},
  booktitle = {Baha'i Stories for Children},
  url = {https://bahaistoriesforchildren.blogspot.com/2017/03/flowers-for-ancient-king.html},
}

APA:
Various. Flowers for the Ancient King. In *Baha'i Stories for Children*.

MLA:
Various. "Flowers for the Ancient King." *Baha'i Stories for Children*, n.d..

Chicago:
Various. "Flowers for the Ancient King." In *Baha'i Stories for Children*, n.d..