BibTeX:
@incollection{Various,
  author = {Various},
  title = {The Martyrdom of the Báb in Tabríz},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2015/07/no-peace-in-city-of-tabriz-on-july-9.html},
}

APA:
Various. The Martyrdom of the Báb in Tabríz. In *Baha'i Stories Blog*.

MLA:
Various. "The Martyrdom of the Báb in Tabríz." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "The Martyrdom of the Báb in Tabríz." In *Baha'i Stories Blog*, n.d..