BibTeX:
@incollection{Various,
  author = {Various},
  title = {While Bahá’u’lláh remained under chains in the Siyah-Chal, His},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/siyah-chal},
}

APA:
Various. While Bahá’u’lláh remained under chains in the Siyah-Chal, His. In *bahaistories.com archive*.

MLA:
Various. "While Bahá’u’lláh remained under chains in the Siyah-Chal, His." *bahaistories.com archive*, n.d..

Chicago:
Various. "While Bahá’u’lláh remained under chains in the Siyah-Chal, His." In *bahaistories.com archive*, n.d..