BibTeX:
@incollection{Various,
  author = {Various},
  title = {1851 Karbilá, Iraq: A disciple of the Báb becomes the first person to whom Baha'u'llah…},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2019/02/1851-karbila-iraq-disciple-of-bab.html},
}

APA:
Various. 1851 Karbilá, Iraq: A disciple of the Báb becomes the first person to whom Baha'u'llah…. In *Baha'i Stories Blog*.

MLA:
Various. "1851 Karbilá, Iraq: A disciple of the Báb becomes the first person to whom Baha'u'llah…." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "1851 Karbilá, Iraq: A disciple of the Báb becomes the first person to whom Baha'u'llah…." In *Baha'i Stories Blog*, n.d..