BibTeX:
@incollection{Various,
  author = {Various},
  title = {Ridvaniyyih Khánum related that when her child was ill, the Master came and…},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/death},
}

APA:
Various. Ridvaniyyih Khánum related that when her child was ill, the Master came and…. In *bahaistories.com archive*.

MLA:
Various. "Ridvaniyyih Khánum related that when her child was ill, the Master came and…." *bahaistories.com archive*, n.d..

Chicago:
Various. "Ridvaniyyih Khánum related that when her child was ill, the Master came and…." In *bahaistories.com archive*, n.d..