BibTeX:
@incollection{Various,
  author = {Various},
  title = {A very unique Child is born},
  booktitle = {Baha'i Stories for Children},
  url = {https://bahaistoriesforchildren.blogspot.com/2014/11/a-very-unique-child-is-born.html},
}

APA:
Various. A very unique Child is born. In *Baha'i Stories for Children*.

MLA:
Various. "A very unique Child is born." *Baha'i Stories for Children*, n.d..

Chicago:
Various. "A very unique Child is born." In *Baha'i Stories for Children*, n.d..