BibTeX:
@incollection{Various,
  author = {Various},
  title = {The Yellow Flower},
  booktitle = {Baha'i Stories for Children},
  url = {https://bahaistoriesforchildren.blogspot.com/},
}

APA:
Various. The Yellow Flower. In *Baha'i Stories for Children*.

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

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