BibTeX:
@incollection{Various,
  author = {Various},
  title = {No mere mortal in His day could claim to be His teacher},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/abdul-baha},
}

APA:
Various. No mere mortal in His day could claim to be His teacher. In *bahaistories.com archive*.

MLA:
Various. "No mere mortal in His day could claim to be His teacher." *bahaistories.com archive*, n.d..

Chicago:
Various. "No mere mortal in His day could claim to be His teacher." In *bahaistories.com archive*, n.d..