BibTeX:
@incollection{Various,
  author = {Various},
  title = {Síyáh-Chál, the name of the prison to which Bahá’u’lláh was taken on},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/siyah-chal},
}

APA:
Various. Síyáh-Chál, the name of the prison to which Bahá’u’lláh was taken on. In *bahaistories.com archive*.

MLA:
Various. "Síyáh-Chál, the name of the prison to which Bahá’u’lláh was taken on." *bahaistories.com archive*, n.d..

Chicago:
Various. "Síyáh-Chál, the name of the prison to which Bahá’u’lláh was taken on." In *bahaistories.com archive*, n.d..