BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {The Younger Brother Who Stayed},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/mirza-muhammad-hasan-bushrui/},
}

APA:
Bahá'í Chronicles editors. The Younger Brother Who Stayed. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "The Younger Brother Who Stayed." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "The Younger Brother Who Stayed." In *Bahá'í Chronicles*, n.d..