BibTeX:
@incollection{Various,
  author = {Various},
  title = {Pamphlets in a Manila Library},
  booktitle = {bahaistories.com archive},
  url = {https://bahaistories.com/subject/teaching},
}

APA:
Various. Pamphlets in a Manila Library. In *bahaistories.com archive*.

MLA:
Various. "Pamphlets in a Manila Library." *bahaistories.com archive*, n.d..

Chicago:
Various. "Pamphlets in a Manila Library." In *bahaistories.com archive*, n.d..