BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {Ḥájí Mírzá Ḥasan, the Afnán},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/%e1%b8%a5aji-mirza-%e1%b8%a5asan-the-afnan/},
}

APA:
Bahá'í Chronicles editors. Ḥájí Mírzá Ḥasan, the Afnán. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "Ḥájí Mírzá Ḥasan, the Afnán." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "Ḥájí Mírzá Ḥasan, the Afnán." In *Bahá'í Chronicles*, n.d..