BibTeX:
@incollection{Various,
  author = {Various},
  title = {Elizabeth Greenleaf’s White Ring-Stone},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/bounties},
}

APA:
Various. Elizabeth Greenleaf’s White Ring-Stone. In *bahaistories.com archive*.

MLA:
Various. "Elizabeth Greenleaf’s White Ring-Stone." *bahaistories.com archive*, n.d..

Chicago:
Various. "Elizabeth Greenleaf’s White Ring-Stone." In *bahaistories.com archive*, n.d..