BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {One of the First to Believe},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/mulla-ahmad-abdal-maraghii/},
}

APA:
Bahá'í Chronicles editors. One of the First to Believe. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "One of the First to Believe." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "One of the First to Believe." In *Bahá'í Chronicles*, n.d..