BibTeX:
@incollection{Various,
  author = {Various},
  title = {On Christmas night 1912, ‘Abdu’l-Bahá visited a Salvation Army shelter in London},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/christmas},
}

APA:
Various. On Christmas night 1912, ‘Abdu’l-Bahá visited a Salvation Army shelter in London. In *bahaistories.com archive*.

MLA:
Various. "On Christmas night 1912, ‘Abdu’l-Bahá visited a Salvation Army shelter in London." *bahaistories.com archive*, n.d..

Chicago:
Various. "On Christmas night 1912, ‘Abdu’l-Bahá visited a Salvation Army shelter in London." In *bahaistories.com archive*, n.d..