BibTeX:
@incollection{Various,
  author = {Various},
  title = {Protecting the Master in 1918},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/protection},
}

APA:
Various. Protecting the Master in 1918. In *bahaistories.com archive*.

MLA:
Various. "Protecting the Master in 1918." *bahaistories.com archive*, n.d..

Chicago:
Various. "Protecting the Master in 1918." In *bahaistories.com archive*, n.d..