BibTeX:
@incollection{Various,
  author = {Various},
  title = {Two Visitors Witness the Revelation of a Tablet},
  booktitle = {Baha'i Stories Blog},
  url = {https://bahaistories.blogspot.com/2019/07/being-present-when-abdul-baha-revealed.html},
}

APA:
Various. Two Visitors Witness the Revelation of a Tablet. In *Baha'i Stories Blog*.

MLA:
Various. "Two Visitors Witness the Revelation of a Tablet." *Baha'i Stories Blog*, n.d..

Chicago:
Various. "Two Visitors Witness the Revelation of a Tablet." In *Baha'i Stories Blog*, n.d..