BibTeX:
@incollection{Various,
  author = {Various},
  title = {While in San Francisco, ‘Abdu’l-Bahá visited a black believer, Mr},
  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. In *bahaistories.com archive*.

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

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