BibTeX:
@incollection{Various,
  author = {Various},
  title = {It took some time for the news of Bahá’u’lláh’s Declaration to reach},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/bahaullah-declaration},
}

APA:
Various. It took some time for the news of Bahá’u’lláh’s Declaration to reach. In *bahaistories.com archive*.

MLA:
Various. "It took some time for the news of Bahá’u’lláh’s Declaration to reach." *bahaistories.com archive*, n.d..

Chicago:
Various. "It took some time for the news of Bahá’u’lláh’s Declaration to reach." In *bahaistories.com archive*, n.d..