BibTeX:
@incollection{Various,
  author = {Various},
  title = {One day in London the Master gave His listeners an unusual, imaginative, yet…},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/tests},
}

APA:
Various. One day in London the Master gave His listeners an unusual, imaginative, yet…. In *bahaistories.com archive*.

MLA:
Various. "One day in London the Master gave His listeners an unusual, imaginative, yet…." *bahaistories.com archive*, n.d..

Chicago:
Various. "One day in London the Master gave His listeners an unusual, imaginative, yet…." In *bahaistories.com archive*, n.d..