BibTeX:
@incollection{BahChronicleseditors,
  author = {Bahá'í Chronicles editors},
  title = {Counting the Pieces of Coal},
  booktitle = {Bahá'í Chronicles},
  url = {https://bahaichronicles.org/aqa-husayn-i-ashchi/},
}

APA:
Bahá'í Chronicles editors. Counting the Pieces of Coal. In *Bahá'í Chronicles*.

MLA:
Bahá'í Chronicles editors. "Counting the Pieces of Coal." *Bahá'í Chronicles*, n.d..

Chicago:
Bahá'í Chronicles editors. "Counting the Pieces of Coal." In *Bahá'í Chronicles*, n.d..