BibTeX:
@incollection{Various,
  author = {Various},
  title = {Why Do Manifestations Appear in Human Form},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/manifestations},
}

APA:
Various. Why Do Manifestations Appear in Human Form. In *bahaistories.com archive*.

MLA:
Various. "Why Do Manifestations Appear in Human Form." *bahaistories.com archive*, n.d..

Chicago:
Various. "Why Do Manifestations Appear in Human Form." In *bahaistories.com archive*, n.d..