BibTeX:
@incollection{Various,
  author = {Various},
  title = {Christmas Eve at Cadogan Gardens},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2021/07/an-example-of-abdul-bahas-humor.html},
}

APA:
Various. Christmas Eve at Cadogan Gardens. In *Baha'i Stories Blog*.

MLA:
Various. "Christmas Eve at Cadogan Gardens." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "Christmas Eve at Cadogan Gardens." In *Baha'i Stories Blog*, n.d..