BibTeX:
@incollection{Various,
  author = {Various},
  title = {While in San Francisco, ‘Abdu’l-Bahá visited a black believer, Mr Charles…},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/sick-caring},
}

APA:
Various. While in San Francisco, ‘Abdu’l-Bahá visited a black believer, Mr Charles…. In *bahaistories.com archive*.

MLA:
Various. "While in San Francisco, ‘Abdu’l-Bahá visited a black believer, Mr Charles…." *bahaistories.com archive*, n.d..

Chicago:
Various. "While in San Francisco, ‘Abdu’l-Bahá visited a black believer, Mr Charles…." In *bahaistories.com archive*, n.d..