BibTeX:
@incollection{Various,
  author = {Various},
  title = {Shaykh Ahmad’s Secret},
  booktitle = {Baha'i Stories for Children},
  url = {https://bahaistoriesforchildren.blogspot.com/2014/11/shaykh-ahmads-secret.html},
}

APA:
Various. Shaykh Ahmad’s Secret. In *Baha'i Stories for Children*.

MLA:
Various. "Shaykh Ahmad’s Secret." *Baha'i Stories for Children*, n.d..

Chicago:
Various. "Shaykh Ahmad’s Secret." In *Baha'i Stories for Children*, n.d..