BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {The Second Who Believed},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/mulla-ali-bastami/},
}

APA:
Bahá'í Chronicles editors. The Second Who Believed. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "The Second Who Believed." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "The Second Who Believed." In *Bahá'í Chronicles*, n.d..