BibTeX:
@incollection{Various,
  author = {Various},
  title = {What most impressed 'Roy' was the spirit of sacrifice which he found among the…},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/unity},
}

APA:
Various. What most impressed 'Roy' was the spirit of sacrifice which he found among the…. In *bahaistories.com archive*.

MLA:
Various. "What most impressed 'Roy' was the spirit of sacrifice which he found among the…." *bahaistories.com archive*, n.d..

Chicago:
Various. "What most impressed 'Roy' was the spirit of sacrifice which he found among the…." In *bahaistories.com archive*, n.d..