BibTeX:
@incollection{Various,
  author = {Various},
  title = {In your recalling the bereavement of Bahá’u’lláh upon the loss of His},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/mirza-mihdi},
}

APA:
Various. In your recalling the bereavement of Bahá’u’lláh upon the loss of His. In *bahaistories.com archive*.

MLA:
Various. "In your recalling the bereavement of Bahá’u’lláh upon the loss of His." *bahaistories.com archive*, n.d..

Chicago:
Various. "In your recalling the bereavement of Bahá’u’lláh upon the loss of His." In *bahaistories.com archive*, n.d..