BibTeX:
@incollection{Various,
  author = {Various},
  title = {Two Placards on the Doors},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/abdul-baha-childhood},
}

APA:
Various. Two Placards on the Doors. In *bahaistories.com archive*.

MLA:
Various. "Two Placards on the Doors." *bahaistories.com archive*, n.d..

Chicago:
Various. "Two Placards on the Doors." In *bahaistories.com archive*, n.d..