BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {His Eminence Kalím (Mírzá Músá)},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/his-eminence-kalim-mirza-musa/},
}

APA:
Bahá'í Chronicles editors. His Eminence Kalím (Mírzá Músá). In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "His Eminence Kalím (Mírzá Músá)." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "His Eminence Kalím (Mírzá Músá)." In *Bahá'í Chronicles*, n.d..