BibTeX:
@incollection{Various,
  author = {Various},
  title = {‘An American friend who had enjoyed the privilege of more than one},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/race-unity},
}

APA:
Various. ‘An American friend who had enjoyed the privilege of more than one. In *bahaistories.com archive*.

MLA:
Various. "‘An American friend who had enjoyed the privilege of more than one." *bahaistories.com archive*, n.d..

Chicago:
Various. "‘An American friend who had enjoyed the privilege of more than one." In *bahaistories.com archive*, n.d..