BibTeX:
@incollection{Various,
  author = {Various},
  title = {The King summons the Báb},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2014/12/the-king-summons-bab.html},
}

APA:
Various. The King summons the Báb. In *Baha'i Stories Blog*.

MLA:
Various. "The King summons the Báb." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "The King summons the Báb." In *Baha'i Stories Blog*, n.d..