BibTeX:
@incollection{Various,
  author = {Various},
  title = {The Prince Who Became the Buddha},
  booktitle = {Baha'i Stories for Children},
  url = {https://bahaistoriesforchildren.blogspot.com/2019/05/time-capsule-lord-buddha.html},
}

APA:
Various. The Prince Who Became the Buddha. In *Baha'i Stories for Children*.

MLA:
Various. "The Prince Who Became the Buddha." *Baha'i Stories for Children*, n.d..

Chicago:
Various. "The Prince Who Became the Buddha." In *Baha'i Stories for Children*, n.d..