BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {Ibn-i-Abhar, Hand of the Cause},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/aqa-mirza-muhammad-taqi-abhari-ibn-i-abhar/},
}

APA:
Bahá'í Chronicles editors. Ibn-i-Abhar, Hand of the Cause. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "Ibn-i-Abhar, Hand of the Cause." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "Ibn-i-Abhar, Hand of the Cause." In *Bahá'í Chronicles*, n.d..