BibTeX:
@incollection{Various,
  author = {Various},
  title = {No peace in the city of Tabriz on July 9, 1850 – the martyrdom of the Báb},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2015/07/no-peace-in-city-of-tabriz-on-july-9.html},
}

APA:
Various. No peace in the city of Tabriz on July 9, 1850 – the martyrdom of the Báb. In *Baha'i Stories Blog*.

MLA:
Various. "No peace in the city of Tabriz on July 9, 1850 – the martyrdom of the Báb." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "No peace in the city of Tabriz on July 9, 1850 – the martyrdom of the Báb." In *Baha'i Stories Blog*, n.d..