BibTeX:
@incollection{Various,
  author = {Various},
  title = {The Most Important Work},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/teaching},
}

APA:
Various. The Most Important Work. In *bahaistories.com archive*.

MLA:
Various. "The Most Important Work." *bahaistories.com archive*, n.d..

Chicago:
Various. "The Most Important Work." In *bahaistories.com archive*, n.d..