BibTeX:
@incollection{Various,
  author = {Various},
  title = {The Guardian’s Unfinished Plans},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/shoghi-effendi-premonition-death},
}

APA:
Various. The Guardian’s Unfinished Plans. In *bahaistories.com archive*.

MLA:
Various. "The Guardian’s Unfinished Plans." *bahaistories.com archive*, n.d..

Chicago:
Various. "The Guardian’s Unfinished Plans." In *bahaistories.com archive*, n.d..