BibTeX:
@incollection{Various,
  author = {Various},
  title = {Lua Getsinger, Herald of the Covenant},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/covenant},
}

APA:
Various. Lua Getsinger, Herald of the Covenant. In *bahaistories.com archive*.

MLA:
Various. "Lua Getsinger, Herald of the Covenant." *bahaistories.com archive*, n.d..

Chicago:
Various. "Lua Getsinger, Herald of the Covenant." In *bahaistories.com archive*, n.d..