BibTeX:
@incollection{Various,
  author = {Various},
  title = {The Governor of Baghdad at this time was a relative of my father, but his enemy},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/ridvan-first-day},
}

APA:
Various. The Governor of Baghdad at this time was a relative of my father, but his enemy. In *bahaistories.com archive*.

MLA:
Various. "The Governor of Baghdad at this time was a relative of my father, but his enemy." *bahaistories.com archive*, n.d..

Chicago:
Various. "The Governor of Baghdad at this time was a relative of my father, but his enemy." In *bahaistories.com archive*, n.d..