BibTeX:
@incollection{Various,
  author = {Various},
  title = {Frugality for Himself, Generosity for Others},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/generosity},
}

APA:
Various. Frugality for Himself, Generosity for Others. In *bahaistories.com archive*.

MLA:
Various. "Frugality for Himself, Generosity for Others." *bahaistories.com archive*, n.d..

Chicago:
Various. "Frugality for Himself, Generosity for Others." In *bahaistories.com archive*, n.d..