BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {Progenitor of Virtue: Mírzá Abu'l-Faḍl and Learning Made Perfect in Service},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/mirza-abul-fadl/},
}

APA:
Bahá'í Chronicles editors. Progenitor of Virtue: Mírzá Abu'l-Faḍl and Learning Made Perfect in Service. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "Progenitor of Virtue: Mírzá Abu'l-Faḍl and Learning Made Perfect in Service." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "Progenitor of Virtue: Mírzá Abu'l-Faḍl and Learning Made Perfect in Service." In *Bahá'í Chronicles*, n.d..