BibTeX:
@incollection{Various,
  author = {Various},
  title = {Bahá'u'lláh's Gifts to the Báb at Kulayn},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2016/12/gifts-from-one-manifestation-of-god-to.html},
}

APA:
Various. Bahá'u'lláh's Gifts to the Báb at Kulayn. In *Baha'i Stories Blog*.

MLA:
Various. "Bahá'u'lláh's Gifts to the Báb at Kulayn." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "Bahá'u'lláh's Gifts to the Báb at Kulayn." In *Baha'i Stories Blog*, n.d..