BibTeX:
@incollection{Various,
  author = {Various},
  title = {The Rich Man, the Poor Man and the Donkey},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/attachment},
}

APA:
Various. The Rich Man, the Poor Man and the Donkey. In *bahaistories.com archive*.

MLA:
Various. "The Rich Man, the Poor Man and the Donkey." *bahaistories.com archive*, n.d..

Chicago:
Various. "The Rich Man, the Poor Man and the Donkey." In *bahaistories.com archive*, n.d..