BibTeX:
@incollection{Various,
  author = {Various},
  title = {Christmas Night at a London Shelter},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/christmas},
}

APA:
Various. Christmas Night at a London Shelter. In *bahaistories.com archive*.

MLA:
Various. "Christmas Night at a London Shelter." *bahaistories.com archive*, n.d..

Chicago:
Various. "Christmas Night at a London Shelter." In *bahaistories.com archive*, n.d..