BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {The Three Uncles of the Báb},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/haji-mirza-siyyid-ali-haji-mirza-siyyid-muhammad-and-haji-mirza-hassan-ali/},
}

APA:
Bahá'í Chronicles editors. The Three Uncles of the Báb. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "The Three Uncles of the Báb." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "The Three Uncles of the Báb." In *Bahá'í Chronicles*, n.d..